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.)