A VPN, or Virtual Private Network, functions to preserve online privacy by encrypting internet traffic and masking the user's IP address. This technology establishes a secure connection between the user's device and a remote server, preventing unauthorized access to sensitive data while browsing. VPNs also allow users to bypass geographical restrictions, accessing content as if they were in a different location. By enhancing privacy and security, VPNs are essential tools for individuals seeking anonymity and protection on the Internet.