phpMyAdmin is a feature-rich tool developed in PHP, that will offer you total control of a MySQL database. You could do literally everything - set up fields, rows and tables, delete them or alter their content, export or import an entire database or only a specific part of it, and execute MySQL commands. The tool is vital when you want to switch web hosting providers, because you could very easily create a full backup of a database in a variety of formats (SQL, CSV, XML). You will end up with one file containing the whole content of the database, so you may download it from the current provider, upload it to the hosting server of the new one and import it via the same tool on their end. Your site shall look exactly the same, simply because all script apps store their data within a database. With phpMyAdmin you may also quickly search and replace content material of your preference across the entire web site - a word, a phrase or a link, for instance.