API Endpoint
An endpoint is a specific URL exposed by an API, tied to a given action (fetch a list of customers, create an order, update a status). It expects a particular request format and returns a structured response, usually in JSON.
It's the concrete point of contact between two systems: an e-commerce back office calling its payment provider's endpoint to confirm a transaction, or a mobile app querying an endpoint on its server to display a product list. On an integration or AI project, new third-party services or external models are usually plugged in at the level of existing endpoints, without touching the rest of the system.
A poorly named endpoint, one without versioning, or one with sloppy error handling becomes a friction point the moment it needs to evolve: changing its structure breaks every client already calling it. The right approach is to version endpoints from the start (for example /v1/, /v2/) and document expected formats precisely, so the API can evolve without breaking existing integrations.
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