The Hasura DuckDB connector provides a GraphQL query layer for DuckDB databases, allowing users to easily expose their data through GraphQL queries. It supports various types of queries, including simple ones, those with predicates, ordering and pagination, and complex queries that utilize relationships. The connector also allows filtering across relationships. With this connector, developers can leverage the power of GraphQL for their data stored in DuckDB databases, whether it's a local instance or one hosted on MotherDuck.