What is an API?
The short answer
An API is a way for two pieces of software to talk to each other. When your app needs to check the weather, take a payment or use an AI model, it usually does so through an API rather than building that capability from scratch.
A simple way to think about it
Imagine ordering food at a counter. You don't walk into the kitchen and cook it yourself, you tell the person at the counter what you want, and they bring it back. An API is that counter, but for software: your app asks another service for something, and gets an answer back, without needing to know how that service works internally.
Where you'll bump into APIs
You probably won't write API code yourself if you're building with a vibe coding tool, but you'll hear the word often, because most useful features rely on one.
- Taking payments (a payments provider's API)
- Sending emails (an email provider's API)
- Using AI features like generating text or images (an AI provider's API)
- Pulling in outside data, like maps or exchange rates
Why it matters even if you don't code
Knowing the word helps you understand what your building tool is doing when it says something needs an "API key" or connection. It usually just means: this feature needs to talk to another service, and that service needs to know it's really your app asking.
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