PIP VPN - Internet Protocol Virtual Private Networks:

IP VPN Defined: An IP VPN is a link between two or more points across the internet or private network with various degrees of security that ensure privacy for all parties. Put more simply, an IP VPN is a dedicated communications network tunneled through another network. One common application is secure communications through the public Internet, and may or may not have security features, such as authentication or content encryption. VPNs can also be used to separate the traffic of different user communities over an underlying network with strong security features.