SQL is a query language that helps in making changes to the database. SQL is a Relational database management language to define, retrieve, manipulate, control the data in the database. It is only used to change the structured data that means which are stored in the form of tables.
MySQL is one of the query languages. It is the first open-source query language. It uses SQL to retrieve the data from the database. MySQL has a lot of versions available online for free. The latest version is MySQL 8.0 GA. It is built on C and C++ languages. MySQL supports Linux, Solaris, Windows, macOS, FreeBSD, and Ubuntu operating systems.
You can watch this video on SQL vs MySQL for a better understanding: