Proxy settings are browser controls that decide whether web requests go directly to a site or are sent first to an intermediary proxy server. In practice, they can be set by the user, by enterprise policy, or by a browser extension with the right permissions. A proxy can forward traffic, filter it, log it, or inspect it before the request reaches its destination.
In cyber security, proxy settings matter because they influence routing, visibility, and trust. Attackers may change them to send traffic through an attacker-controlled relay, hide network destinations, capture credentials, or evade security tools. Defenders use managed proxy settings to enforce egress controls, apply content filtering, and centralize monitoring. Unexpected changes to proxy configuration are a common sign of compromise, especially when they appear in browsers or extensions that can mediate session traffic.