GraphQL lets each client fetch exactly the data it needs in one request, from a typed schema that describes the API.
- No over-fetching. The client names the fields it wants and gets only those.
- No under-fetching. Related data, like a user and their posts, comes in one request instead of several round trips.
- A typed contract. The schema defines every type and field, and the server rejects queries for fields that do not exist.
- Self-documenting. Introspection lets tools read the schema, which powers editor tooling, documentation and debugging.
- Web and mobile clients can ask the same endpoint for different fields.
- The API evolves without versions. New fields do not break old queries, and old fields are deprecated instead of removed.
Rewriting in plainer words…
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