A virtual private network (VPN) is a private data network that makes use of the public telecommunication infrastructure, maintaining privacy through the use of a tunneling protocol and security procedures. The idea of the VPN is to give the company the same capabilities at much lower
cost by using the shared public infrastructure rather than a private one.

This creates a secure tunnel between the points within the VPN. Only devices with the correct "key" will be able to work within the VPN. The VPN network can be residing within a normal company LAN (Local Area Network), and/or over public networks such as Internet