Server-side scripting is executed by a web server; client-side scripting is executed by a browser. Client-end scripts are embedded in a website's HTML markup code, which is housed on the server in a language that's compatible with, or compiled to communicate with, the browser.

First of all you must understand between the difference between server side scripting and client side scripting language. Server side scripting always executed by a server whereas a client-side scripting runs on browsers. Javascript, HTML and CSS is an example of client side scripting.

Most of the people get confused if JSP is server side or client side. The answer is JSP is server side scripting that runs on server side after receiving a HTTP request