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What is an API?

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Quick answer

An API (Application Programming Interface) is a set of rules that lets two pieces of software talk to each other. It's like a waiter taking your order to the kitchen and bringing back food — you ask for data or an action, and the API delivers it.

Key things to understand

  1. It's a defined way for one program to request things from another.
  2. It hides the complexity — you use it without knowing the internals.
  3. APIs power logins, maps, payments, and weather in countless apps.
  4. They let developers build on top of existing services quickly.

People also ask

What does API stand for?
Application Programming Interface — a set of rules for how software components communicate.
What is an API in simple terms?
A messenger that takes a request to a system and returns the response, like a waiter between you and the kitchen.
Why are APIs important?
They let apps share data and features, so developers can build powerful tools without reinventing everything.

Part of the guide: How the Internet Works →