As we all know but again I want to define the term "VPN" stands for the Virtual Private Network. VPN provides network connectivity over a long physical distance. By the means of VPN long-distance and secured network connections are established. Because work over both private networks as well as public networks so the VPN is also known as one of the form of the WAN(Wide Area Network) which enable sharing and other similar network services. VPN usually do not provide any new functionality that is not already offered through other alternate mechanisms, but a VPN implements those services more efficiently and cheaply in most cases.