GraphQL is a query engine for APIs that can be used to create queries using your existing data. GraphQL gives clients the ability to ask for the data they need. It makes it easy to develop APIs over time and allows developers to use powerful tools. Send a GraphQL query directly to your API to get exactly what you want. GraphQL queries always return predictable results. GraphQL apps are stable and fast because they control the data they receive, not the server. GraphQL queries not only access the properties of a resource, but also follow references between them. GraphQL APIs can access all data required by your app in a single request, unlike REST APIs that require multiple URLs to load. GraphQL apps can be fast even with slow mobile network connections.