What is the function of a proxy server?

A proxy server functions primarily as an intermediary between users and the internet. When a user requests access to a web resource, the request goes to the proxy server first. The proxy server then retrieves the resource from the internet and forwards it back to the user. This process can enhance privacy, improve security, and provide content filtering.

By acting in this intermediary role, a proxy server can also cache frequently accessed content, which might help reduce bandwidth usage and improve load times for users accessing the same resources. Additionally, it can help implement access controls, monitor user activity, and provide anonymity by masking the user's IP address.

This essential role in managing communications between users and external internet resources distinguishes the proxy server from other functionalities associated with the other answer choices.