Model

Friendly Description: A model in AI is the finished, trained brain that does the work, the thing you actually use. It's the result of all that training: a big bundle of numbers and structure that knows how to do a particular job, like answering questions or recognizing faces. When people say "GPT-4" or "Claude" or "Stable Diffusion," they're naming specific models.

Example: Different models are good at different things. You might use one model to generate images, another to summarize long documents, and a third to help you write code. Each one was trained for its specialty, like specialists in different fields of medicine.