A connection between two devices that acts as though it’s a direct connection even though it may physically be circuitous. The term is used most frequently to describe connections between two hosts
in a packet-switching
network. In this case, the two hosts can communicate as though they have a dedicated connection even though the packets
might actually travel very different routes before arriving at their destination. An X.25 connection is an example of a virtual circuit.
Virtual circuits can be either permanent (called PVCs) or temporary (called SVCs).