A servier side scripting language is one that gets parsed by the server before being sent to the client's browser. PHP and ASP are just some examples of server side scripting. As for the data storage, you could use a database (MySQL, MS-SQL, etc) if your server was setup with these. Then again; with server side languages (or at least in PHP), you could use a flat (text) file database.
For more information on how to use PHP to insert data into a mysql database, check out this website:
http://www.php-mysql-tutorial.com
Hope this helps.
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