What is an API?
An API is a set of rules that lets two pieces of software talk to each other, such as your website and a payment or booking service.
An API (application programming interface) is a defined way for one program to ask another for data or to do something. When your website shows a map, takes a card payment, pulls in reviews or sends a form to your CRM, it is usually talking to another service's API. Access is often controlled with an API key, which works like a password for software. APIs change over time, and old versions can be retired.
Why it matters for your business: APIs let your tools work together without retyping data. Treat API keys like passwords and never post them publicly.
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