# Platform

URL: /platform · Id: `page:/platform`

> What the platform is, what it guarantees, and the steps from a Definition to a served call.

The platform serves an API from one [Definition](/reference/concepts#definition) and keeps the promises below for every API it serves.

- [Guarantees](/platform/guarantees): The promises every API on the platform keeps, each enforced by code and checked by a test.
- [From Definition to call](/platform/lifecycle): The steps an API passes through, from the Definition a Startup writes to the call a Customer makes and the record it leaves.