phpMyAdmin is a feature-rich tool developed in PHP, that will offer you total control over a MySQL database. You may do absolutely everything - set up fields, rows and tables, remove them or change their data, export or import an entire database or only a particular part of it, and execute MySQL commands. The tool is necessary in case you want to switch web hosting companies, because you can effortlessly generate a full backup of a database in different formats (SQL, CSV, XML). You will end up with only one file which contains the entire content of the database, so you can easily download it from the present provider, upload it to the web server of the new one and import it using the same tool on their end. Your website will look exactly the same, due to the fact that all script apps store their content inside a database. With phpMyAdmin you can also conveniently search and replace information of your preference across the whole internet site - a word, a phrase or a link, for example.