Hasura is an open-source GraphQL API platform that can be used by content writers and developers to build secure, content-heavy applications for multiple platforms. It acts as a headless CMS, allowing the backend system to be decoupled from the frontend, enabling developers to create rich experiences with any framework or platform of their choice. Hasura provides a basic built-in CMS called Hasura Console, which lets users manage data in Postgres. Developers can also choose to build custom content types over Hasura GraphQL APIs as a foundation for their custom CMS. React Admin and TinaCMS are two frontend tooling options available that enable easy customization. Additionally, Hasura supports remote joins, allowing developers to integrate external CMS-specific solutions like Contentful or Wordpress. It also provides robust security features such as authentication, access control, and allow lists.