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GraphQL Federation: Composing Multiple Subgraphs

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GraphQL Federation: one schema, many services

A large organization might have separate services for users, orders, products, and reviews — each with their own team and database. GraphQL Federation lets each service expose its own GraphQL schema (subgraph) and composes them into a single supergraph that clients query through a single endpoint.

The gateway handles routing: a query that needs user name (from Users service) and their orders (from Orders service) is split, executed in parallel, and stitched into one response.

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