Glossary
What is API?
A door one piece of software opens so another can ask it for data or tell it to do something, without a person clicking through the screens.
Also written as application programming interface.
When your website form puts a new lead straight into your CRM, or your booking tool sends a text through your phone provider, an API is doing the talking. It is a published set of requests an app accepts: “give me this contact”, “create this invoice”, “send this message”.
Why you hear about it so often
Almost every automation and every AI agent is built on APIs. If an app has a good API, it can be connected to everything else you use. If it has none, the only way to move data in or out is by hand, or by a person copying and pasting.
A quick test before you buy software
Ask the vendor two questions: do you have an API, and do you support webhooks or MCP? A yes to both means the tool can grow with you instead of becoming an island.
