SQL's power comes from its ability to handle large amounts of structured data efficiently. It enables the creation of tables with defined relationships using primary keys and foreign keys, ensuring data integrity and consistency across the database. SQL also supports complex queries to extract specific information, allowing users to filter, sort, and aggregate data according to their needs.

Another important feature of SQL is its transaction management. It ensures that a series of operations, such as multiple updates or inserts, are executed as a single unit of work. If any part of the transaction fails, SQL can roll back the changes to maintain data consistency. This feature is vital for applications requiring high reliability, such as banking systems.

SQL's use extends beyond just querying databases; it also allows for creating and managing user roles and permissions, ensuring that only authorized individuals can access sensitive data. This makes SQL a critical tool in securing and optimizing modern data-driven applications.