What is the main difference between Client side Java Script and and Server side Java Script how actully they run on both side?

Clientside Javascript encompasses the core language plus extras such as the predefined objects, only relevant to running Javasript in a browser.The clientside javascript is embedded directly in the HTML pages and is interpreted by the browser completly at the run time.Serverside javascript also encompasses the core language plus extas as the predefined objects and functions only relevant to running Javasript in a server.The serverside javascripts are compiled before they are deployed. You don't mention that Javascript can be disabled by the client and therefore disables any scripts from being deployed. However, serverside scripts execute whether javascript is enabled or not.