JavaScript vs. Jscript

JavaScript is a scripting language developed by Netscape Communications.
The Netscape Navigator interprets JavaScript embedded into Web pages.
JavaScript is used for developing web applications.
It is not dependent on Sun Microsystem's Java language.

JScript
Microsoft JScript is an open implementation of Netscape's JavaScript.
JScript is a scripting language designed to create active online content. ActiveX controls, Java programs, etc can be linked and automated in the web pages using JScript.

What is the difference between Client side JavaScript and Server side JavaScript.

Client side java script comprises the basic language and predefined objects which are relevant to running java script in a browser. The client side java script is embedded directly by in the HTML pages. This script is interpreted by the browser at run time.

Server side java script also resembles like client side java script. It has relevant java script which is to run in a server. The server side java scripts are deployed only after compilation.

What is the difference between Client side JavaScript and Server side tJavaScript?

Client-Side JavaScript (CSJS) 
It is JavaScript that enables the enables web pages on browsers to run active online content.

Server-Side JavaScript (SSJS) 
It is JavaScript that enables back-end access to databases, file systems, and servers