Virtual Private Network
Or VPN, is a network that is constructed by using public wires.
The most common and known is the internet and it is considered one of the most securests ways to create VPN network.
There are many numbers of systems that are able to create networks using the Internet as the transparent for transporting data to warieties of computers.
The VPN systems use security mechanisms to make sure, that only approved users, can access the network and that the data cannot be misused.
With right usage VPN can be used worldwide for transfering data, between more access points.
VPN is a secure way to your privacy… http://eogn.com/images/privacyblog/vpn-security.png