GraphQL
GraphQL is an open-source data query and manipulation language for APIs, and a runtime for fulfilling those queries with existing data. It was developed internally by Facebook in 2012 before being publicly released in 2015. It provides a more efficient and powerful alternative to the REST architectural style by allowing clients to define the exact structure of the data they need. According to the official GraphQL documentation, this prevents problems such as over-fetching and under-fetching of data.
Core Principles and Features
The primary component of a GraphQL implementation is the Schema, which uses a strong type system to describe the data available on the server. Clients interact with the service using three main operation types: Queries for reading data, Mutations for writing or modifying data, and Subscriptions for real-time updates. This flexibility makes it highly popular in modern Web-Development and Mobile-Development. Developers often use tools like Apollo Client or Relay to integrate these services into applications. For a deeper technical overview, the Wikipedia entry on GraphQL provides extensive history and context.