Virtual Private Network (VPN) is a computer network in which some of the links between nodes are carried by open connections or virtual circuits in some larger network (eg Internet), rather than physical cables. Data protocols layer of virtual network are said to tunnel through the larger network when this is appropriate. A common application is secure communications through the public Internet, VPN, but no specific security features such as authentication or content encryption. Virtual private networks, could be used for traffic of different user groups to separate the main network with strong security.

A VPN is the best performance, effort, or may have a service level agreement (SLA) between the VPN client and VPN service provider. Usually, VPN has a topology more complex than point to point.

A VPN allows computer users to go to edit the IP address space, other than the actual computer that connects to the Internet.