GPU (Graphics Processing Unit)

Friendly Description: A GPU is a special kind of computer chip that can do lots of math problems at the same time. It was first invented to make video game graphics look amazing, but it turns out the same trick is perfect for training AI. Where a regular computer chip does one thing very fast, a GPU does thousands of small things all at once, exactly what big neural networks need.

Example: Companies that train large AI models often have entire warehouses full of GPUs working in parallel. Without them, training a modern AI model might take years instead of weeks.