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API

A way for two different pieces of software to talk to each other.

API is short for Application Programming Interface. It's basically a set of rules that says what one system will accept and what it will send back. Most commonly today that means a website sending a request and getting data back as JSON. This is how a booking system can talk to a website, how a payment provider processes a transaction, or how an AI tool gets plugged into an existing app. Pretty much every integration you can think of is built on some kind of API underneath.

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