proxy(A computer (or the software that runs on it) that acts as a barrier between a network and the Internet by presenting only a single network address to external sites); proxy server(A server located on a network between client software, such as a Web browser, and another server. It intercepts all requests to the server to determine whether it can fulfill them itself. If not, it forwards the request to another server)
cache/proxy server(A server running Windows Media Services for which a cache/proxy plug-in has been enabled, allowing the server to provide cache and proxy support to another Windows Media server)
web proxy(A method exposed in a client object model to issue requests from SharePoint to a remote service that developers can use in apps for SharePoint)
