Does a Virtual Private Network (VPN) provide an encrypted connection from outside networks or from ISPs to the internal network?
closed as not a real question by AJ Henderson, Terry Chia, Gilles, Scott Pack, Antony Vennard Apr 13 '13 at 19:41
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.
You want to use a VPN because you want to protect whatever data you are sending over the network to your endpoint through encryption.
This sounds suspiciously like a homework question.