# Super Jankari

> Technology


## Posts

- [How does auto-brightness work? How does a smartphone screen automatically adjust its brightness](https://superjankari.com/how-does-auto-brightness-work-how-does-a-smartphone-screen-automatically-adjust-its-brightness/): How does auto-brightness work? How does a smartphone screen automatically adjust its brightness Do you know? The topic of today’s explainer is—how does auto-brightness work? Consider this: you step out of a dark room directly into sunlight, and your phone screen instantly brightens. How is this everyday mystery actually solved? Are devices continuously using the front camera to monitor the external light and environment? Or is there a secret process happening within the internal circuitry behind the screen? This is something we all experience daily, but frankly, the engineering behind it is truly surprising. Okay, let’s dive in. Today, we will ... Read more
- [How to create your own Android OS? A complete roadmap for building a custom Android OS from AOSP](https://superjankari.com/how-to-create-your-own-android-os-a-complete-roadmap-for-building-a-custom-android-os-from-aosp/): How to create your own Android OS? A complete roadmap for building a custom Android OS from AOSP You have likely used Samsung’s One UI, seen Xiaomi’s HyperOS, or operated OnePlus’s OxygenOS. When these companies launch new operating systems every year, it often feels like creating an Android OS is beyond the reach of an ordinary person. We tend to think it requires a trillion-dollar company like Google and secret labs staffed by thousands of scientists. But what is the reality The truth is, it isn’t impossible rocket science. Every Android OS in the world is built upon the foundation of ... Read more
- [How does a camera work? A complete guide from the lens to the digital image](https://superjankari.com/how-does-a-camera-work-a-complete-guide-from-the-lens-to-the-digital-image/): How does a camera work? A complete guide from the lens to the digital image Cameras have become an integral part of our lives today. You pull out your smartphone, open the camera app, tap once, and the photo is ready—whether it’s a selfie, a Reel, or a family moment. But have you ever wondered how a camera actually “sees”? How does it transform light into an image and convert a scene into a clear photograph or video? Is a camera merely a lens, or is there a complex scientific system of optics, mirrors, sensors, shutters, processors, and software working inside? ... Read more
- [How does a speaker work? How is sound created from an electrical signal](https://superjankari.com/how-does-a-speaker-work-how-is-sound-created-from-an-electrical-signal/): How does a speaker work? How is sound created from an electrical signal? Friends, listening to music has become so easy these days. You simply play a song on your mobile, turn on the TV, put in your earphones, or stand in front of a DJ speaker, and within seconds, music, dialogue, a voice from a call, or a singer’s voice reaches your ears. But have you ever wondered how a small, silent speaker actually produces sound? There is no singer sitting inside it, nor is there a fan blowing air; yet, how does it produce various sounds like bass, treble, ... Read more
- [How do LED and LCD TVs work? What is inside the TV](https://superjankari.com/how-do-led-and-lcd-tvs-work-what-is-inside-the-tv/): How do LED and LCD TVs work? What is inside the TV Friends, from the outside, a slim TV mounted on a wall looks like nothing more than a screen and a frame. Yet, the moment you press a button on the remote, faces, colors, and a moving world appear on that very same black screen. What components are actually hidden inside the television? Which part handles the power? Which one interprets the video signal, and which one commands the millions of pixels? How does white light transform into a green field, a blue sky, and colorful clothing? Why does the ... Read more
- [How does a walkie-talkie work? How does sound travel such a long distance via radio waves](https://superjankari.com/how-does-a-walkie-talkie-work-how-does-sound-travel-such-a-long-distance-via-radio-waves/): How does a walkie-talkie work? How does sound travel such a long distance via radio waves Friends, imagine you are lost in a dense forest where there is absolutely no mobile network. Even though you have a phone, the call won’t go through. Suddenly, the walkie-talkie in your bag beeps and transmits your voice to a companion several kilometers away. No SIM card, no mobile number, and no mobile tower. So, how exactly does this small device send your voice through the air over such a distance? What happens inside the moment you press the walkie-talkie button? How are radio waves ... Read more
- [How does a printer work? How are photos and text printed on paper](https://superjankari.com/how-does-a-printer-work-how-are-photos-and-text-printed-on-paper/): How does a printer work? How are photos and text printed on paper Friends, printers have become such a normal part of our lives today that we simply press the ‘print’ button on a mobile or computer, and within seconds, the content appears on paper. But have you ever really wondered what a printer actually does on the inside? How does a photo, document, or design visible on the screen suddenly transfer onto paper? And the most fascinating part is—how does it create so many color shades and details when it only uses a few basic colors? Sometimes the print comes ... Read more
- [How does Bluetooth work? How does sound travel from your phone to your earbuds](https://superjankari.com/how-does-bluetooth-work-how-does-sound-travel-from-your-phone-to-your-earbuds/): How does Bluetooth work? How does sound travel from your phone to your earbuds Just imagine: you play a song on your phone and slip it into your pocket, and it starts transmitting sound to your earbuds without any wires. No cables, no internet, and no visible signals—yet the music reaches your ears perfectly. But the question is, how exactly does this happen? How does the phone transmit data through the air? How do Bluetooth devices recognize each other? What happens during pairing? And the biggest question of all: if Bluetooth transmits data through the air, can anyone else intercept it? ... Read more
- [How was the blue LED created? The full story behind the discovery of the blue LED](https://superjankari.com/how-was-the-blue-led-created-the-full-story-behind-the-discovery-of-the-blue-led/): How was the blue LED created? The full story behind the discovery of the blue LED Your phone screen, the white LED lights in your home—none of these things could have been created back then because a single color was missing: blue. For nearly 30 years, Sony, top Japanese universities, and major global companies tried to create it. But everyone faced three major hurdles—three “walls”—that no one could break down. The first: creating the right crystal, which kept breaking. The second: getting the current to flow, which simply wouldn’t happen. The third: achieving the exact right color, which never turned out ... Read more
- [How does WhatsApp make money? The business model behind the free app](https://superjankari.com/how-does-whatsapp-make-money-the-business-model-behind-the-free-app/): How does WhatsApp make money? The business model behind the free app Have you ever wondered how the app where you check your messages first thing in the morning actually makes money? Apple earns by selling iPhones. Google shows you ads with every search. Even Netflix charges you a monthly fee. Yet, WhatsApp’s 3.3 billion users send around 150 billion messages daily, and there is no subscription fee. There are no ads and no games. Still, in 2014, Mark Zuckerberg paid $19 billion—roughly ₹1.4 lakh crore—for it. Just think, how much was WhatsApp earning at that time Absolutely zero. Was this ... Read more
- [How do solar panels work? How is electricity generated from sunlight](https://superjankari.com/how-do-solar-panels-work-how-is-electricity-generated-from-sunlight/): How do solar panels work? How is electricity generated from sunlight Just imagine if I told you that a power plant operates right above your head every day—one that never shuts down, requires no petrol or diesel, and emits no smoke. Yet, it delivers so much energy that its power is almost impossible to fathom when compared to the needs of all human civilization. You might find that hard to believe. We are talking about the Sun. The very Sun whose heat drives you indoors at noon—prompting you to switch on fans, coolers, or air conditioners—is the same source whose light ... Read more
- [How does an inverter work? How do the lights turn on the moment the power goes out?](https://superjankari.com/how-does-an-inverter-work-how-do-the-lights-turn-on-the-moment-the-power-goes-out/): How does an inverter work? How do the lights turn on the moment the power goes out? Imagine you are studying at night or sleeping comfortably in the breeze of a fan. Suddenly, the power goes out. The room plunges into darkness, but the very next moment—without anyone touching a switch—the lights turn on automatically. The fan starts spinning again. It feels as if someone has waved a magic wand. But this isn’t magic; it is the work of that box mounted on your wall known as an inverter. The question is: how does this box provide electricity when the mains ... Read more
- [How does a drone work? A comprehensive look at mechanical design, sensors, flight controllers, and GPS.](https://superjankari.com/how-does-a-drone-work-a-comprehensive-look-at-mechanical-design-sensors-flight-controllers-and-gps/): How does a drone work? A comprehensive look at mechanical design, sensors, flight controllers, and GPS. To understand the mechanical design of a drone—along with its electronic systems, controllers, sensors, intelligent algorithms, and even satellite technology—let us trace the evolution of drone design, starting from the simplest models to modern-day drones. The simplest drone design Let us first consider a drone design with a single propeller. While a single-propeller drone can generate enough lift to stay airborne, controlling it is difficult; it can only move vertically up and down. Another major issue is that the drone’s body tends to spin in ... Read more
- [How does satellite TV work? How do TV channels travel from the satellite to your home?](https://superjankari.com/how-does-satellite-tv-work-how-do-tv-channels-travel-from-the-satellite-to-your-home/): How does satellite TV work? How do TV channels travel from the satellite to your home? Satellites have significantly changed the way we live. In this article, we will explore how satellite television works and why there is so much money in this broadcasting business. Towards the end, we will also look at why satellite TV broadcasts do not experience buffering, unlike internet videos. Basic information about satellites to understand satellite TV To properly understand satellite TV broadcasting, we first need some basic knowledge about the components of a satellite and how they function. As you can see, the Earth revolves ... Read more
- [How did VHS and VCRs work? How did an entire movie fit into a small cassette](https://superjankari.com/how-did-vhs-and-vcrs-work-how-did-an-entire-movie-fit-into-a-small-cassette/): How did VHS and VCRs work? How did an entire movie fit into a small cassette Take a look at this—a small plastic cassette containing nothing but a thin strip. Yet, it used to hold an entire movie. The most curious thing is that it had no memory card, no hard disk, and no gigabytes of digital storage. So, where did hours of video footage fit inside it? To understand this, we need to step back in time. In those days, there were no home internet packs or YouTube; instead, a bulky machine sat beneath the TV. It was called a ... Read more
- [What is a SIM card and how does it work? Find out what's inside it.](https://superjankari.com/what-is-a-sim-card-and-how-does-it-work-find-out-whats-inside-it/): What is a SIM card and how does it work? Find out what’s inside it. Friends, reach into your pocket right now and take out your phone. There is a tiny object inside your phone; it may look small, but without it, making calls, sending messages, and using the internet would be impossible. We are talking about the SIM card. Have you ever wondered what is actually inside this small plastic SIM? How does the network know that the SIM belongs to you? How does your number start working when you insert it into a different phone? And perhaps the most ... Read more
- [How an OTP Reaches Your Phone](https://superjankari.com/how-an-otp-reaches-your-phone/): How an OTP Reaches Your Phone Have you ever wondered how an OTP reaches the mobile phones of millions of people around the world every day? Does a human being send it? Just think about it: you press a single button, and a few seconds later, the OTP is on your phone. But what actually happens during those few seconds? It is not just a story about six digits; thousands of computers, hundreds of servers, and millions of signals work together behind the scenes. The most interesting part is that the OTP does not exist for you until you click “Send ... Read more
- [What is Artificial Intelligence and how does it work](https://superjankari.com/what-is-artificial-intelligence-and-how-does-it-work/): What is Artificial Intelligence and how does it work Have you ever imagined a world where machines think, understand, and make decisions like humans, making our lives so easy that we don’t have to struggle with every task? This is no longer just a dream but a reality, and that reality is known as Artificial Intelligence (AI). But the question remains: how exactly does Artificial Intelligence work? What role does it play in our lives, and will it replace us in the future? In this article, we will explore these questions about Artificial Intelligence in simple language and understand how this ... Read more
- [How is electricity generated and how does it reach our homes](https://superjankari.com/how-is-electricity-generated-and-how-does-it-reach-our-homes/): How is electricity generated and how does it reach our homes Have you ever wondered how the electricity that lights up our homes, charges our mobile phones, and powers machines across the globe is actually generated? We flip a switch every day, and the lights come on instantly. However, the story behind this is fascinating and somewhat complex. Electricity has become an essential part of our lives today; if the power goes out for even a single day, we realize just how dependent we are on it. Just imagine—how could massive cities, factories, trains, and hospitals function without electricity? Generating, storing, ... Read more
- [What is a Graphics Card How does a GPU work, and what are its types](https://superjankari.com/what-is-a-graphics-card-how-does-a-gpu-work-and-what-are-its-types/): What is a Graphics Card How does a GPU work, and what are its types Have you ever noticed that even though your laptop or desktop has the latest CPU and plenty of RAM, things run smoothly when performing basic tasks like opening Word, Excel, or PowerPoint? However, the moment you launch a game or run an editing app, your system slows down or starts hanging. A major reason for this could be the lack of a dedicated graphics card. In this article, we will explore graphics cards in detail. Beyond simply processing graphics data, modern graphics cards are also used ... Read more
- [How does a mobile tower work, How does your voice reach another phone](https://superjankari.com/how-does-a-mobile-tower-work-how-does-your-voice-reach-another-phone587-2/): How does a mobile tower work, How does your voice reach another phone Friends, we spend hours talking on the phone every day. But have you ever stopped to wonder where your voice actually goes? How does the sound from your mouth reach another person’s phone, located kilometers away? What role do those visible mobile towers play in this process? Why does the voice break up or stutter even when the network signal is full? Why does the signal vanish the moment you step into an elevator or a basement? And how does that tiny SIM card inside your phone tell ... Read more
- [What are Cores and Threads in a CPU](https://superjankari.com/what-are-cores-and-threads-in-a-cpu/): What are Cores and Threads in a CPU You have likely heard that a specific CPU has 4 cores, or that another has 8 cores and 16 threads. But do you know what these terms actually mean? What exactly are cores and threads, and how do they impact CPU performance? In this article, we will explain cores and threads in simple language so that the next time you buy a CPU, laptop, or desktop, you can make an informed decision regarding them. Let’s get started. What is a CPU Core The concepts of cores and threads were introduced to make processing ... Read more
- [What is Cache Memory? A Complete Guide to L1, L2, and L3 Cache Memory](https://superjankari.com/what-is-cache-memory-a-complete-guide-to-l1-l2-and-l3-cache-memory/): What is Cache Memory? A Complete Guide to L1, L2, and L3 Cache Memory You have likely heard the term “cache memory” mentioned when discussing the specifications of laptops, computers, or mobile phones—specifically regarding how much cache memory a device has. But have you ever wondered what cache memory actually is and how it affects the speed of these devices? In this article, we will explore what cache memory is, understand the differences between L1, L2, and L3 cache, and see how they help boost CPU speed. We will also discuss why having a larger amount of cache memory is important ... Read more
- [How does a CPU work? The CPU working process explained simply.](https://superjankari.com/how-does-a-cpu-work-the-cpu-working-process-explained-simply/): How does a CPU work? The CPU working process explained simply. Friends, have you ever wondered how everything happens in the blink of an eye whenever you open an app or a file on your laptop or mobile? And what exactly is the process taking place inside the CPU at that very moment? In today’s article, we are going to decode exactly that. So, let’s get started. What is a CPU? The full form of CPU is Central Processing Unit. It is also known as the brain of the computer. Some people call it a Processor, while others call it a ... Read more
- [Apple's New Event, iPhone 18 Pro, AirPods 5, Apple Watch Series 12, and iPhone Duo](https://superjankari.com/apples-new-event-iphone-18-pro-airpods-5-apple-watch-series-12-and-iphone-duo/): Apple’s New Event, iPhone 18 Pro, AirPods 5, Apple Watch Series 12, and iPhone Duo Friends, Apple’s latest event has concluded. Once again, with this new generation, Apple has endeavored to elevate smartphones and personal technology to a new level. This time, Apple’s primary focus is on AI, performance, cameras, battery life, health features, and a new foldable iPhone experience. The event saw the unveiling of the iPhone 18 Pro and iPhone 18 Pro Max, alongside the AirPods 5, Apple Watch Series 12, Apple Watch Ultra 4, and the foldable iPhone Duo. iPhone 18 Pro and iPhone 18 Pro Max Let’s ... Read more
- [What is Google Drive and how do you use](https://superjankari.com/what-is-google-drive-and-how-do-you-use/): What is Google Drive and how do you use We are going to discuss Google Drive. We will explore what it actually is, its relevance today, and how—as well as for what purposes—you can use it. So, let’s get started and find out more. What is Google Drive? To begin with, let’s define what Google Drive is: it is a free service provided by Google that offers online storage. As we all know, our mobile phones and computers come with built-in storage devices—such as ROM, SSD, or hard disks. We use these to store our data, whether it consists of videos, ... Read more
- [Who controls the internet? Learn how the internet works.](https://superjankari.com/who-controls-the-internet-learn-how-the-internet-works/): Who controls the internet? Learn how the internet works. Have you ever wondered, friends, who actually runs the internet? Who controls the internet across the globe? You might think that internet service providers like Jio, Airtel, or BSNL control it. But that isn’t true; if one company stops providing internet service, another is available to take its place. You might then assume that the government controls the internet. However, that isn’t entirely accurate either. While the government can remove certain posts or block websites, these measures can be bypassed, and no single government has significant control over the global internet. This ... Read more
- [What are HDD and SSD? Understand the differences between them](https://superjankari.com/what-are-hdd-and-ssd-understand-the-differences-between-them/): What are HDD and SSD? Understand the differences between them The invention of the computer has proven to be a great boon for all of us, as computers offer numerous features that are incredibly beneficial. Today, computer usage has become so commonplace that we rely on them for almost any task. In this modern era, they assist us in everything from education to space exploration. Since their inception, computers have shrunk in size while their processing capabilities have steadily increased. You may be aware that early computers were massive in size, whereas today’s computers are compact enough to be easily carried ... Read more
- [What is RAM? How does it work, and how much RAM do you need?](https://superjankari.com/what-is-ram-how-does-it-work-and-how-much-ram-do-you-need/): What is RAM? How does it work, and how much RAM do you need? If you are interested in technology, you should be familiar with certain key components of a computer. A complete computer system consists of various parts such as RAM, ROM, a processor, a graphics card, and other devices. Today, we will explore one of these important components: RAM. When you bought a new phone or computer, you were likely asked a common question: “How much RAM does it have?” You might not fully realize why RAM is so important or why it matters. That is exactly what this ... Read more
- [What is a Motherboard and What Are Its Types](https://superjankari.com/what-is-a-motherboard-and-what-are-its-types/): What is a Motherboard and What Are Its Types Today, we are going to discuss motherboards again. Usually, when building a CPU (PC), we carefully select and configure all the components involved. We research and purchase the best possible processor, RAM, graphics card, hard drive, SSD, and so on for our system. But what about the motherboard? We often simply buy whatever the shopkeeper suggests because we lack sufficient knowledge about motherboards. Not everyone is fully aware of the different types of motherboards available or how much load a specific motherboard can handle. So, today we will discuss these points and ... Read more
- [How to Download and Install Google Chrome on a Laptop](https://superjankari.com/how-to-download-and-install-google-chrome-on-a-laptop/): How to Download and Install Google Chrome on a Laptop Today, I will show you how to download Chrome on your laptop. You likely already have the Google Chrome browser on your phone. If you want to download and install it on your laptop as well, let’s see how. It is very simple. Connect to the Internet on Your Laptop First, you need to turn on the internet on your laptop; ensure your internet connection is active. My internet is already connected. Next, press the Windows button on your keyboard. Open an Internet Browser After pressing the Windows button, search for ... Read more
- [How to Create a New Telegram Account](https://superjankari.com/how-to-create-a-new-telegram-account/): How to Create a New Telegram Account Do you want to create a new Telegram account? Do you want to know how to easily set up a Telegram account? Then this video is for you. In this video, I will show you how to easily create a Telegram account. Install the Telegram App First, you need to install the Telegram app from the Play Store on your phone. Once installed, open the app. After searching for and installing Telegram, the app will appear on your phone; tap on it to open it. Click on ‘Start Messaging’ As soon as you open ... Read more
- [How to Sketch and Shade](https://superjankari.com/how-to-sketch-and-shade/): How to Sketch and Shade In this video, I will explain how to create a good sketch and how to shade effectively. Many beginners struggle with the process; while they can manage the initial structure, they often face difficulties when it comes to shading—specifically regarding blending techniques, determining where to apply dark or light tones, and observing the subject accurately. The goal is to replicate exactly what is seen in the reference image. The biggest challenge is often a lack of focus; beginners might look at a reference photo but fail to retain the details clearly when they start drawing. They ... Read more
- [How to Create an Instagram Account in 2026](https://superjankari.com/how-to-create-an-instagram-account-in-2026/): How to Create an Instagram Account in 2026 Nowadays, having an Instagram account is essential for sharing photos, videos, and Reels on the platform. If you wish to create your own Instagram account, this post provides a step-by-step guide on how to set up an Instagram ID in 2026. Creating an Instagram ID or account is very simple. You can set it up using either your mobile number or email ID. By following the steps outlined below, you can easily create your new Instagram account. Open the Instagram App to Create an Account First, open the Instagram app on your phone. ... Read more
- [7 Great iPhone Settings to Save Battery](https://superjankari.com/7-great-iphone-settings-to-save-battery/): 7 Great iPhone Settings to Save Battery If you own an iPhone and feel the battery drains too quickly, adjusting certain settings can help reduce battery consumption. Additionally, some settings can make the iPhone experience feel smoother and more focused. Many iPhone users complain about having to keep Low Power Mode on all day. While battery life depends on various factors—such as the iPhone model, battery health, screen brightness, network conditions, and app usage—adjusting specific settings correctly can help minimize unnecessary battery drain. Let’s explore some of these useful iPhone settings. 1. Turn off Background App Refresh First, open the Settings ... Read more

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