Plugs mount on the end of the cable and attach the internal components of the
units to each other. The total plug unit includes a male jack (the plug itself)
and a female receptacle (the mounting hole that goes on the equipment). Plugging a
jack into its receptacle is known as patching. Two jacks plus the cable in between
them are known as a patch cord (fig 3-5). When you want to connect a VTR with a
monitor you "patch" them together (fig 3-6).