What is Proxy Serverv | How proxy server Work

It will act as the intermediate between client request and the server resource. While requesting from the client for resource such of file,picture or web page. It will validate the client request if it valid the get the resource from the server and provide to the client system.
Proxy server it disappear the real server address to the hidden.It is not real server but it will act as real server.For Internet purpose it will access client computer and stop the employee to access the unwanted website.When the proxy it is focus on word wide web it is called web proxy. Most proxy server deny the website in the black list.