Could you help me explain the structure, advantages, and basic working principles of GraphQL? I'd especially like to go into detail about its comparative advantages over REST and how it's used in data fetching/loading scenarios. In what use cases is it preferred?
What is GraphQL and how does it work?
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The biggest difference between GraphQL and REST is that with GraphQL, the user can retrieve the exact data they need **in a single request**. While REST provides different endpoints for different resources, with GraphQL you optimize both network traffic and response by querying only the fields you need. For example, while you might need to make three separate REST API calls to fetch a user profile, with GraphQL you can pull all the related data in a single query.