Virtual Private Networks (VPNs) are the most effective way to keep your business communications over the Internet private and secure. A Virtual Private Network (VPN) is a communications network tunneled through another network, and dedicated for a specific network. One common application is secure communications through the public Internet, but a VPN need not have explicit security features, such as authentication or content encryption. VPNs, for example, can be used to separate the traffic of different user communities over an underlying network with strong security features.