GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.
Or is is only a CQRS escenary?
https://www.martinfowler.com/bliki/CQRS.html
GraphQL https://graphql.org/ A query language for your API
GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.
Interactive GraphQL Landscape https://landscape.graphql.org/category=graph-ql-adopter&format=card-mode&grouping=category
All Specs: https://spec.graphql.org/
Current Spec (June 2018): https://spec.graphql.org/June2018/
Work Draft: https://spec.graphql.org/draft/