SQL (Structured Query Language) is a standard programming language used to manage and manipulate relational databases. It is widely used for tasks such as storing, retrieving, updating, and deleting data in databases like MySQL, PostgreSQL, Oracle, and Microsoft SQL Server. SQL uses simple, English-like syntax, making it easy to learn and understand. With SQL, users can create and modify database structures using commands like CREATE, ALTER, and DROP. It also allows for querying data using SELECT, inserting data using INSERT, updating with UPDATE, and deleting using DELETE. Advanced features include joins, subqueries, aggregate functions, and transactions, which help in handling complex data relationships and ensuring data integrity. SQL is essential for backend development, data analysis, business intelligence, and database administration. Its reliability, efficiency, and ability to handle large volumes of structured data make it a foundational skill in the world of data and software development.