Router port forwarding is allowing routing inbound/outbound traffic to and from a specific ip to an internal address.
For an example when making use of cambackup cloud recording service in many cases you need to open and forward a port to your camera. This can be sometimes tricky depending on your Router.
There are special sites such as setuprouter.com that can guide you in this process.
at cambackup we always will help you connect your camera to our system free of charge. simply click on the chat button and we will help you.