Server-Side Scripting

Includes writing the applications executed by the server at run-time to process client input or generate documents  in response to client request. So the server side script consists of the directives embedded in the Web page for the server to process before passing the page to the requestor. 

It is usually used to provide interactive web sites that interface to databases or other data stores. 

This is different from client-side scripting where scripts are run by the viewing web browser, usually in JavaScript. The primary advantage to server-side scripting is the ability to highly customize the response based on the user's requirements, access rights, or queries into data stores.

PHP, JSP, ASP…. etc, are the server side scripting technologies.