phpMyAdmin is a feature-rich tool written in PHP, that will provide you with 100 % control of a MySQL database. You could do literally anything - create fields, rows and tables, delete them or modify their data, export or import an entire database or just a certain part of it, and execute MySQL commands. The tool is irreplaceable when you want to switch hosting companies, as you may easily create a full backup of a database in different formats (SQL, CSV, XML). You'll end up with a single file containing the entire content of the database, so you could download it from the present provider, upload it to the hosting server of the new one and import it using the same tool on their end. Your website will look exactly the same, simply because all script apps store their content within a database. With phpMyAdmin you may also conveniently search and replace content of your preference across the whole internet site - a word, an expression or a link, for instance.