VPN

definice

https://csrc.nist.gov/glossary/term/virtual_private_network

rfc4949.txt

virtual private network (VPN)
      (I) A restricted-use, logical (i.e., artificial or simulated)
      computer network that is constructed from the system resources of
      a relatively public, physical (i.e., real) network (e.g., the
      Internet), often by using encryption (located at hosts or
      gateways), and often by tunneling links of the virtual network
      across the real network. (See: tunnel.)