[wishinghand]

A Headless CMS means you define all of the frontend interpretation of the content. Basically a GUI for your database.

If you have lots of queries happening behind the scenes whenever someone makes a request that seems basic- like how Facebook gets a list of comments on a post, plus the friends who made them, and a list of different reactions to each comment, and other stuff that rapidly creates a complex graph- then GraphQL simplifies. The REST way involves all of those extra calls, GraphQL gets everything in one request.