What is the fundamental role of a proxy server in internet communication?

A proxy server acts as an intermediary between a client and an online resource. Instead of the user system connecting directly to the destination server, the request is sent to the proxy, which forwards, filters, logs, or inspects the traffic according to policy. This design allows organizations to control web access, enforce acceptable use policies, inspect content, apply authentication, and hide some internal network details from external destinations. A proxy does not increase the processing power of the user’s device. It is not limited to email, although mail security gateways can perform similar intermediary functions for email traffic. It also does not directly connect endpoint agents to web servers as its core function. In security architecture, proxies are useful control points because they sit in the request path and can make decisions before a user reaches a site or downloads content. Reference/topics: Network Security 3.3, proxies and URL filtering; Network Security 3.6, enterprise browsers.