phpMyAdmin is a feature-rich tool developed in PHP, that will provide you with full control over a MySQL database. You may do literally everything - create fields, rows and tables, delete them or modify their content, export or import an entire database or only a particular part of it, and execute MySQL commands. The tool is essential when you want to switch web hosting companies, due to the fact that you can conveniently create a full backup of a database in a variety of formats (SQL, CSV, XML). You will end up with a single file containing the entire content of the database, so you can download it from the current provider, upload it to the hosting server of the new one and import it using the same tool on their end. Your site shall look exactly the same, due to the fact that all script applications store their content in a database. With phpMyAdmin you could also quickly search and replace content material of your choosing across the whole web site - a word, a phrase or a link, for example.