Fireflies API is built on top of GraphQL. GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.
A user is a person who has an account on Fireflies. A given API Key can access data of the user who generated the API Key and the users who are part of the same team if the API Key is generated from a team admin account.