A VPN (Virtual Private Network) is a computer network that is implemented in an additional software layer (overlay) on top of an existing larger network for the purpose of creating a private scope of computer communications or providing a secure extension of a private network into an insecure network such as the Internet.
Wikipedia http://en.wikipedia.org/wiki/VPN
Unfortunately, they will stop offering free accounts sign-up on January 1st of next year due to usage abuses.
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