Port forwarding
Updated: 04/26/2017 by Computer Hope
Alternatively called port mapping, port forwarding is a method of directing network traffic over a network router to another computer or piece of networking equipment. For example, if a home user wanted to access their home computer remotely or an application needed access to their network they could use port forwarding.
With port forwarding you specify a unique network port number, for example, port 20 for FTP traffic and tell the router to direct that traffic to an alternate location if it's encountered.