What are the main features and advantages of using Spring Data in applications?

Spring Data simplifies working with databases by providing a convenient abstraction layer over various storage technologies. Key features and advantages:

• Automatic repository creation: just define an interface, and Spring Data will generate the implementation for standard CRUD operations.
• Support for various stores: relational databases (JPA), NoSQL (MongoDB, Cassandra, etc.).
• Convenient query building mechanism: methods with names reflecting query logic, e.g., findByLastName(String lastName).
• Built-in support for pagination and sorting.
• Integration with Spring Framework: transaction management, dependency injection.

Example of a repository interface for JPA:

public interface UserRepository extends JpaRepository<User, Long> {
    List<User> findByLastName(String lastName);
}

This allows for quick and efficient data handling, reducing boilerplate code.