What is Hasura?

Hasura is an open-source GraphQL server that provides instant realtime APIs over Postgres. It helps developers build GraphQL apps backed by Postgres or incrementally move to GraphQL for existing applications using Postgres. Key features include powerful queries, realtime capabilities, remote schema merging, webhook triggers, access control, high performance, and an admin UI with migrations. The Hasura GraphQL Engine can be deployed on various platforms such as Heroku, Docker, or DigitalOcean. It supports Postgres types and integrates with existing auth systems for field-level access control.