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, рхдю Apr 13 at 19:41
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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.