MySQL data directory is a place where MySQL stores its data. Each subdirectory under this data dictionary represents a MySQL database. By default, the information managed my MySQL = server mysqld is stored in the data directory.

The MySQL data directory is the location on a file system where MySQL stores its databases, tables, and related data files. By default, it’s typically located in /var/lib/mysql on Linux systems, but it can vary depending on the installation method and configuration. You can also find this information in the MySQL configuration file (my.cnf).