It seems like you're referring to "VPN," which stands for Virtual Private Network. A VPN is a technology used to secure internet access over the internet. It allows users to access互联网、文件、和服务 while keeping their activities private. VPNs can work in a few different ways, but the most common method is using a secure or encrypted connection. Some popular VPNs include OpenVPN, Wireshark, and NetDP.