GraphQL is a client->server data query definition language developed by Facebook. There's a lot of tools that can read and write that query language. Apollo a

GraphQL is a client->server data query definition language developed by Facebook. There's a lot of tools that can read and write that query language. Apollo and Relay are two different full-featured JS client libraries for making GraphQL queries. A good place to start reading is http://graphql.org/ http://graphql.org/ .