GraphQL is an application layer server-side technology that is developed by  Facebook for executing queries with existing data. GraphQL can optimize  RESTful API calls. It gives a declarative way of fetching and updating your data. GraphQL helps you to load data from server to client. It enables programmers to choose the types of requests they like to make.  It provides us with a more efficient way to design, create, and consume our APIs. Basically, it’s the replacement for REST.