A proxy site acts as an intermediary server between a user's device and the internet. When a user accesses a proxy site, their web requests are routed through the proxy server, which then fetches the requested content on their behalf. This process masks the user's original IP address, helping to maintain anonymity and privacy online. Proxy sites are often used to bypass geo-restrictions, access blocked websites, or enhance security by hiding the user's true location. However, not all proxy sites are secure; some may log user activity or inject ads, so it's important to use trusted services.