Dual WAN router is the router which is equipped with two WAN (Internet) ports and can be used to connect to two Internet connections.
This product is useful if Internet connection is very important to you and you have very low tolerance with Internet outage and do not want to rely on Internet connection from single ISP only.
Since there are two WAN ports, it can be used to connect to two different Internet connections from different ISPs at the same time with load balancing feature, so that you can enjoy greater and reliable Internet service
If not, you can also configure first Internet connection as primary and the other as backup Internet connection, so that it will switch over to backup connection should the primary connection fails.[custom-facebook-feed]