In previous sections, the guided tour discussed how to fetch data using GraphQL queries. Though refetching data can have the incidental effect of modifying data in Relay's local store (if the refetched data has changed), we haven't discussed any ways to intentionally modify our locally stored data.
This section will do just that: it will discuss how to update data on the server and how to update our local data store.
The Relay store is a cache of GraphQL data, associated with a given Relay environment, that we have encountered during the execution of an application.
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