GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data.

GraphQL is a syntax that describes how to ask for data, and is generally used to load data from a server to a client. GraphQL has three main characteristics:

• It lets the client specify exactly what data it needs.
• It makes it easier to aggregate data from multiple sources.
• It uses a type system to describe data.

{
  allFilms {
    films {
      title
    }
  }
}

{
  "data": {
    "allFilms": {
      "films": [
        {
          "title": "A New Hope"
        },
        {
          "title": "The Empire Strikes Back"
        },
        {
          "title": "Return of the Jedi"
        },
        ...

GraphQL supports various programming languages 

• C# / .NET

• Clojure

• Elixir

• Erlang

• Go

• Groovy

• Java

• JavaScript

• PHP

• Python

• Scala

• Ruby

You can see the same code at https://graphql.org/code/ in various programming languages.