Which type of proxy requires explicit configuration in client software?

A non-transparent proxy requires explicit configuration in client software because it acts as an intermediary that does not automatically intercept the user's traffic. The client must know about this proxy's existence and must be configured to route its traffic through it, usually by specifying the proxy's IP address and port in the settings of the client application or system.

This type of proxy is beneficial in environments where precise management, control, or monitoring of client requests is necessary, allowing for functionalities such as content filtering or access control to be applied. Other types of proxies operate differently; for instance, a transparent proxy might intercept traffic without needing any configuration from the user, making it less flexible in certain use cases. Similarly, anonymous proxies often provide some degree of concealment of the client's IP without requiring explicit configuration, while reverse proxies typically serve requests on behalf of servers rather than clients.