GraphQL is a really important use case for Prisma. That is using Prisma as the "data layer" on top of your database when implementing a GraphQL server (e.g. using Apollo Server). However, it's not the only use case since you can effectively use it with any application that needs to access a database (e.g. REST or gRPC APIs). We actually wrote a blog post exactly on this topic: https://www.prisma.io/blog/prisma-and-graphql-mfl5y2r7t49c/

You can also find examples for the various use cases here: https://github.com/prisma/prisma-examples/tree/prisma2

Please let me know if that clarifies it or if you have more questions! :)