What Is an API?
An API (application programming interface) is a defined way for one piece of software to request data or actions from another. It specifies what requests can be made, in what format, and what responses come back. AI services, payment systems, maps, and weather data are commonly accessed through APIs.
How an API Works
A program sends a request, often over the internet, to an API endpoint; the service processes it and returns a response, commonly in a structured format such as JSON.
APIs and AI
Developers use AI model APIs to add features such as text generation to their own apps, usually paying based on usage, for example per token.
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🔗 Related Terms
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Last updated: September 29, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.