The initials VPN stand for the term Virtual Private Network. The aim and simple concept of a Virtual Private Network is that it provides users with the ability to access a private network (and therefore individual computers and servers on a private network) from a remote unsecured point outside of that network, without compromising the security of the private network itself.
In effect a VPN creates a tunnel through unsecured networks, which clients can use to access their private network without interference install master vpn on pc from the rest of the unsecured networks. As VPNs therefore have to transmit private information across unsecured networks such as the world wide web, they need to ensure that the data exchanged across these networks is kept secure by employing a combination of encryption on the data packets and authentication to allow access to only those users with permission.