In Java and the Spring Framework, a Spring Data repository is a high-level abstraction that provides a mechanism for encapsulating storage, retrieval, and search behavior that is specific to a particular data source, such as a relational database
The most basic repository is JpaRepository
JpaRepository extends PagingAndSortingRepository which in turn extends CrudRepository.
Their main functions are:
CrudRepository mainly provides CRUD functions.PagingAndSortingRepository provides methods to do pagination and sorting records.JpaRepository provides some JPA-related methods such as flushing the persistence context and deleting records in a batch.