I think you're referring to phpMyAdmin..
mysqladmin is the tool shipped with MySQL. It's used to create and drop databases from the running server.
phpMyAdmin is a PHP-based frontend to your running server with which you can do just about anything (eg. create/drop datasbases and tables, run queries, insert data from textfiles and dumping data to the screen or download). I use phpMyAdmin on a regular basis and it's a great tool!