SQL, or Structured Query Language, is a programming language used for managing and manipulating relational databases. It is used to create, insert, update, and delete data within a database, as well as perform various other operations such as querying and analyzing data. MySQL, on the other hand, is an open-source relational database management system (RDBMS) that uses SQL as its language for managing databases. It is one of the most popular and widely used database systems, known for its reliability, scalability, and performance. MySQL supports a wide range of SQL commands and functions, allowing users to perform various database operations such as creating tables, inserting data, updating records, deleting data, and querying data using SQL statements. It is commonly used in web applications and is compatible with many programming languages, making it a popular choice for developers.