phpMyAdmin is a feature-rich tool developed in PHP, which will give you complete control of a MySQL database. You can do absolutely everything - set up fields, rows and tables, delete them or modify their data, export or import a whole database or only a certain part of it, and execute MySQL commands. The tool is essential when you need to switch hosting companies, due to the fact that you could easily generate a full backup of a database in different formats (SQL, CSV, XML). You will end up with a single file containing 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 using the same tool on their end. Your website will look exactly the same, simply because all script applications store their data within a database. With phpMyAdmin you could also quickly search and replace content of your choice across the whole internet site - a word, a phrase or a link, for instance.