This document provides an overview of GraphQL, including: - GraphQL allows clients to request multiple resources from a server in a single request. - It is not a JavaScript library but a query language that can be used with any database. - Many popular companies and organizations use GraphQL, including Facebook, GitHub, and The New York Times. - GraphQL supports features like queries, mutations, variables, aliases, and fragments. - Resources are provided to learn more about building scalable APIs with GraphQL.