SQL, or Structured Query Language, is a powerful tool used to interact with and manage relational databases. It allows users to store, retrieve, update, and delete data efficiently. Originally developed to implement E.F. Codd's relational model, SQL has become the standard language for database management systems like MySQL, Oracle, PostgreSQL, and Microsoft SQL Server. With SQL, you can perform a wide range of operations, such as creating and modifying database structures, querying data to extract meaningful insights, and managing user permissions. Its simplicity and versatility make it an essential skill for developers, data analysts, and anyone working with data-driven applications.