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Querying Data
Once data is pulled into Gatsby, your pages and components specify what data they access through GraphQL queries.
Main Guides 4
Page queries→
Pages can specify exactly the data they require from sources via GraphQL queries.
Component queries→
Components can specify exactly the data they require from sources via GraphQL queries, though they cannot use variables in the query.
Explore data (GraphiQL)→
GraphiQL is a query IDE available in local development. It shows you the data that a GraphQL query returns alongside that query. Most Gatsby users compose their queries in GraphiQL and then cut-and-paste them into their Javascript files.
Gatsby without GraphQL→
If you find GraphQL confusing, or just want to simplify things, it's possible to use an “unstructured data” approach -- no GraphQL required.