GraphQL is a Language for querying databases from client-side applications. On the backend, GraphQL specifies to the API on how to present the data to the client. GraphQL redefines developers’ work with APIs offering more flexibility and speed to market; it improves client-server interactions by enabling the former to make precise data requests and obtain no more and no less, but exactly what they need.
Like most of the client-server application, GraphQL has both client and server:
GraphQL Ruby enables a Ruby implementation of GraphQL.
GraphQL Yoga. Developed by Prisma, this fully-featured GraphQL server has a number of configurations that improve the developer experience. GraphQL Yoga was built on Express and Apollo servers, well-established node servers, and GraphQL middleware libraries.
GraphQL clients are Libraries that construct queries and send them to the server.
Apollo Client caches requests and normalizes data saving valuable network traffiс. Beyond that, Apollo Client comes with many more features like error management, support for pagination and optimistic UI, prefetching of data, and connection of the data layer to the view layer.