“The API” by itself is rarely enough information. If someone says, “We need to call the API,” the next question is, “Which endpoint?” An API isn’t one giant door where every request goes. It’s a set of specific doors, and each one has a job.
Think about a service desk with different windows. One handles new applications, one handles payments, one handles address changes, one handles cancellations. The building is the whole API. Each window is an endpoint.
How it shows up
In a REST API, an endpoint often looks like a URL path: one for customers, one for invoices, one for a specific invoice by ID. The HTTP method tells the window what action you want: GET reads, POST creates, PUT or PATCH updates, DELETE removes. The endpoint is the window, the method is the verb you say at it. This shows up when AI tools connect systems. Ask an agent to pull invoices from QuickBooks, create a deal in a CRM, or post a message in Slack, and under the hood it’s calling endpoints. Call the wrong one, or send the wrong shape of information, and the system rejects it. Endpoints matter for webhooks too: a webhook is a URL waiting for another system to send it information, and that receiving URL is an endpoint.
Why you care
You don’t need to memorize endpoint syntax. You need the model: one API can expose many actions, and each action has a specific address, expected input, and expected result. “Connect these tools” is never one action. It’s a set of specific windows the software has to use correctly, one request at a time.