SQL (Structured Query Language) is a standardized programming language used for managing and manipulating relational databases. It allows users to perform various operations such as querying data, inserting, updating, deleting records, and creating or modifying database structures. SQL is widely used for tasks like retrieving data with SELECT statements, filtering results with WHERE clauses, and organizing data using GROUP BY and ORDER BY. Its simplicity and powerful features make it essential for database management systems like MySQL, PostgreSQL, and SQL Server. SQL is a key skill for database administrators and developers working with relational databases.