A GPU is a chip built to paint millions of pixels at once, using thousands of small cores working side by side. This animated explainer shows how a GPU differs from a CPU, why that parallel design made GPUs the engine of modern AI, and the difference between built-in graphics and a graphics card.
A chip built for pictures
GPU = Graphics Processing Unit. It works out the color of every pixel on screen. A 4K screen has about 8.3 million pixels. And it redraws them many times every second.
CPU vs. GPU
A CPU is the computer’s main brain. It has a few powerful cores (workers). A GPU has thousands of simpler cores. Experts for tricky jobs vs. an army for simple ones.
Many small jobs at once
A 4K screen updating 60 times a second needs. …about 500 million pixel colors every second. A few big cores would quickly fall behind. Thousands of small cores split the job at once.
Why AI loves GPUs
AI runs on huge amounts of simple math. Mostly multiplying big grids of numbers. Like pixels, that math splits into small pieces. So chips built for games became AI workhorses.
Built-in or separate card
Many laptops have a GPU built into the main chip. It shares the computer’s regular RAM. A separate graphics card has its own fast memory. More power for games and video, but more heat.
Bonus: Where ‘GPU’ came from
Graphics helper chips existed before the name. In 1999 a chipmaker marketed the first ‘GPU’. Now the word covers chips in phones and data centers.
More Tech Terms, Explained
This is part of my Tech Terms Explained series: everyday tech words, explained in plain English, with simple animations. Watch the whole series on YouTube and subscribe to The Tech Ranch so you don’t miss the next one.
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