Hi Rajnish Pathak,
I'm Stefano an Independent Advisor, here to help you.
The basic difference between a workstation and a server is that a workstation is a computer used for high end applications, while a server is a device or an application that perform services for connected clients.
You can find a full explanation about the difference of the two here:
https://www.diffen.com/difference/Server_vs_Wor...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.