Introduction - If you have any usage issues, please Google them yourself
Basically, Port Forwarding is that you can set your router to let internet users access your computer that behind your router.You router have a public ip and your computer just have a private ip.Internet users can just directly access your router, but not your computer.So if you are using utorrent or others P2P software and if you want get a high download speed, you must let internet users can directly access your computer.Then you must set your router and add port mapping.Often you must login into your router' s administrator page and manually add port mapping. If you download movie or file from internet using azureus, utorrent or BitComet and want to a very high download speed, you must know how to operate your router to add or delete port mappings.