This tutorial demonstrates how to use GraphQL Mesh and Hasura Remote Joins to create a data graph. The process involves setting up a new project with GraphQL Mesh, creating a config file for the data source, running GraphQL Mesh, adding the API endpoint as a remote schema in Hasura Cloud, and establishing relationships between Hasura's GraphQL API and APIs sourced via GraphQL Mesh. By using GraphQL Mesh as a gateway to other services or as a local GraphQL schema that aggregates data from remote APIs, developers can create a single GraphQL endpoint for multiple different sources combined.