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A VPN, or Virtual Private Network, is a cryptosystem that allows you to secure your data as it travels over an insecure network such as the Internet.
While this may sound similar to the SSH cryptosystem, VPNs have a different purpose. As far as the user is concerned, she will be able to do anything she normally would be able to do, even when she is away from the network. Because of this, VPNs are popular with telecommuters and with offices that need to share resources over physically separate locations.

