> ## Documentation Index
> Fetch the complete documentation index at: https://wundergraphinc-brendan-add-sof-link.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Subgraph

> Subgraphs are the building blocks of a federated graph. Each subgraph in a Federated GraphQL Architecture is responsible for defining its own part of the schema and handling the corresponding queries.

Before you can interact with a subgraph, you need to [`create`](/cli/subgraph/create) it. Each subgraph is mapped to a GraphQL service that can respond to the relevant GraphQL schema.