What is a virtual private network?

A virtual private network (VPN) is built on top of existing physical Internet networks. A VPN provides a secure communications tunnel for information transmitted between the private and public networks. Read more about VPNs.

The National Institute of Standards and Technology (NIST) has issued a Special Publication about VPNs, SP 800-77 [PDF - 3.2 MB].

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Content last reviewed on January 15, 2013
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