Combine multiple GraphQL services into one API that clients can query as if it were a single system.
As organizations grow, putting every part of a GraphQL API into one service can become difficult to maintain. Federation allows different teams or services to own different parts of a graph while a gateway presents a unified API to clients.
For example, one service might own users while another owns products and another owns orders. Federation lets these domains work together while keeping ownership separated, but it also introduces distributed-system concerns such as service dependencies, schema coordination, and network failures.
What you'll walk away knowing