API (Application Programming Interface)

Friendly Description: An API is like a friendly waiter at a restaurant. You don't go into the kitchen yourself; you tell the waiter what you want, and they bring it back from the chef. In the AI world, an API is the way an app talks to a powerful AI model behind the scenes. Your favorite writing app might use an AI API to suggest better wording, without you ever needing to know the AI is there.

Example: When you use a customer support chat that gives surprisingly smart answers, the company probably built that chat by calling an AI API. Their app sends your question to the AI, the AI sends back a thoughtful reply, and the chat shows it to you, all in a second or two.