A virtual private Network (VPN) extends a private network across a public network, such as the Internet . It enables a computer to send and
receive data across shared or public networks as if it were directly connected to the private
network, while benefiting from the functionality, security and management policies of the private
network. This is done by establishing a virtual point-to-point connection through the use of dedicated connections, encryption, or a
combination of the two.  photo 330px-Virtual_Private_Network_overview.svg_zpsklvz62us.png
A virtual private network connection across the Internet is similar to a wide area network (WAN) link between the sites. From a user perspective, the extended network resources are accessed in
the same way as resources available from the private network.
VPNs allow employees to securely access their company’s intranet while traveling outside the
office. Similarly, VPNs securely and cost-effectively connect geographically disparate
offices of an organization, creating one cohesive virtual network. VPN technology is also used by
ordinary Internet users to connect to proxy servers for the purpose of protecting one’s identity.
To prevent disclosure of private information, VPNs typically allow only authenticated remote
access and make use of encryption techniques.

Security: VPNs provide security by the use of tunneling protocols and through security procedures such as encryption.

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