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What is a CPU?
A CPU is the main chip in a computer, the part that follows instructions and runs your programs one step after another.
- Category Hardware
- Also called central processing unit
- Updated 20 Oct 2026
CPU, explained simply
CPU stands for central processing unit. It is often called the brain of a computer.
It handles everyday jobs like opening apps, running your browser and managing files. It is good at doing a few different tasks very fast.
For AI, a CPU can run small models, but it is slower than a GPU. Big models usually need a GPU.
On ITG Now, our free tool guides say if a tool can run on a normal CPU or needs a stronger graphics card.
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Questions people ask about CPU
CPU vs GPU: what is the difference?
A CPU does a few varied tasks very quickly. A GPU does many simple tasks at once, which suits AI and graphics.
Can I run AI on a CPU?
Yes, small models run fine on a CPU. It is just slower than using a GPU.
Does a faster CPU make AI chatbots faster?
Not for online chatbots, because they run on company servers. It matters only when you run a model on your own computer.