A "VPN server" refers to a server that is either responsible for managing VPN services within a network or is a server that is part of a VPN infrastructure setup. It is used in environments where secure remote access is needed, such as internal organization, external connections, or data security purposes. The server may handle multiple VPN connections or manage the overall network security, depending on the context. It is likely used in web development, enterprise environments, or cloud computing for handling encrypted data.