Virtual private network (VPN), based on ISP or NSP, is a virtual and private data communication network set up in the public network.

虚拟专用网vpn是依托ISP或NSP，构建在公共网络上的，虚拟、私人专用数据通信网络。

youdao

The secure communication link is a virtual private network communication link over the computer network in which one or more data values that vary according to a pseudo-random sequence are inserted into each data packet.

FORBES: VirnetX Files Infringement Case Vs. Apple With ITC