But it's more than just a protocol: The Graph also has an implementation, which is open source and uses GraphQL. GraphQL is a query language for APIs, developed and open sourced by Facebook.

GraphQL is becoming a go-to query language for companies to interact with data. Understand what GraphQL does and why it’s so popular.

GraphQL, the “little JSON data interface that could,” has now attracted a company to build a data virtualization service around it.