What are the difference between DOMAIN and WORKGROUP and What is Client/Server?

Hi all,
If any one can provide me the information or short description about client/server
then its so helpful for me to solve my problem.

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a server is a computer that runs a website or a video game server it basically if you have a website it is running on a server a client is a the service that controls the server. a domain is a web address or to recognize something by. a workgroup is a group of computers on a network working together.