Define exactly what data your GraphQL API can provide and what clients are allowed to ask for.
A GraphQL schema is the contract between your client and server. It describes the types of data available, the fields those types contain, and the operations clients can perform. Unlike a typical REST API, clients can use this schema to understand the API without guessing what endpoints exist.
Schemas are built using GraphQL's type system and usually define objects, queries, mutations, and sometimes subscriptions. A well-designed schema makes an API easier to understand while giving GraphQL enough information to validate requests before they reach your application logic.
What you'll walk away knowing