phpMyAdmin is a tool written in PHP intended to handle the administration of MySQL over the Web. Currently it can create and drop databases, create/drop/alter tables, delete/edit/add fields, execute any SQL statement, manage keys on fields. 

With phpMyAdmin you can: 
create and drop databases 
create, copy, drop and alter tables 
delete, edit and add fields 
execute any SQL-statement, even batch-queries 
manage keys on fields 
load text files into tables 
create and read dumps of tables 
export data to CSV values 
administer multiple servers and single databases