VPN = Virtual Private Network
"A network tunnel created between two or more authenticated terminations (users). It is an advanced provision for private voice and data networking via a public or other multiply accessed switched networks. The network connection appears to the user as an end-to-end, nailed-up circuit without actually involving a permanent physical connection, as in the case of a leased line. VPNs retain the advantages of private networks but add benefits like capacity on demand."
See: "virtual private network (VPN)." Hargrave's Communications Dictionary, Wiley, Frank Hargrave, Wiley, 1st edition, 2001. Credo Reference, http://proxy.aup.fr/login?url=https://search.credoreference.com/content/entry/hargravecomms/virtual_private_network_vpn/0?institutionId=1416. Accessed 12 Feb. 2020.
