What is a VPN?
A
VPN or Virtual Private Network is a secure channel across an untrusted medium such as the internet. To the user it appears as if they are connected to a private network even though they are not. Generally they are implemented on the firewall that sits between the internet and the host or server being accessed. The client system logs in across the internet using what appears to be normal authentication methods but which are in fact encrypted to prevent snooping.
VPN or other methods of secure access are the only way anything behind a firewall should be accessed as otherwise you are exposing in unencrypted form anything you access behind a firewall.
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