GraphQL Schema
A GraphQL schema is a core component of GraphQL APIs that defines the structure of available data, including types, fields, queries, mutations, and subscriptions. It serves as a contract between the client and server, specifying what operations can be performed and what data can be requested. The schema is written in the GraphQL Schema Definition Language (SDL), which provides a human-readable format for describing the API's capabilities.
Developers should learn GraphQL schema design when building or consuming GraphQL APIs, as it ensures type safety, enables efficient data fetching, and prevents over-fetching or under-fetching issues common in REST APIs. It is essential for defining complex data relationships, implementing authorization rules, and generating documentation automatically, making it crucial for scalable applications in web and mobile development.