phpMyAdmin provides users to access MySQL or MariaDB using web interface, you can read more about the program from the official website here.
It is an important tool in your CPanel web hosting, from backing up databases, restoring them, editing, searching and executing SQL statements. You can do wide variety of operations on the database.
In this video below, we will show you some basic phpMyAdmin functions and usage, you can always refer to official documentation for further help.