A VPN server is a type of server that enables the hosting and delivery of VPN services. A VPN, or virtual private network, is a mechanism for creating a secure connection between a computing device and a computer network, or between two networks, using an insecure communication medium such as the public Internet. When a user connects to a VPN server, their data is encrypted and tunneled through the server, which hides their actual public IP address and makes it appear as if they are logging on from elsewhere globally.

VPNs are used to add security and anonymity to users when they connect to web-based services and sites. They can also be used to extend access to a private network to users who do not have direct access to it, such as an office network allowing secure access from off-site over the Internet. VPNs are commonly used to bypass internet censorship and to protect sensitive data like work-related information.

In summary, a VPN server is a server that enables the hosting and delivery of VPN services, which are used to create secure connections between computing devices and computer networks using an insecure communication medium such as the public Internet.