AI Glossary
API
Also called application programming interface
What does “API” mean?
API: A defined way for software to talk to other software. For AI, it usually means sending a request with a prompt and settings to a provider's servers and getting the model's output back. Most AI-powered apps are built on model APIs rather than running models themselves.

What is an example of “API”?
A note-taking app can add a "summarize" button by sending your note to a model provider's API and showing the reply.