phpMyAdmin is a feature-rich tool coded in PHP, that will give you 100 % control over a MySQL database. You could do practically anything - set up fields, rows and tables, erase them or modify their content, export or import an entire database or just a particular part of it, and execute MySQL commands. The tool is essential when you want to switch web hosting providers, simply because you could effortlessly generate a full backup of a database in different formats (SQL, CSV, XML). You will end up with one file that contains the whole 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 via the same tool on their end. Your site will look exactly the same, due to the fact that all script apps store their content in a database. With phpMyAdmin you could also conveniently search and replace content of your choosing across the whole website - a word, an expression or a link, for instance.