Many routers support "failover," which allows them to fail over to a secondary connection when one internet connection goes down, but you lose the connection during the switchover (and then you'll have the same problem when the primary connection comes up again and it switches back). Failover also doesn't aggregate the connections to make them faster or more reliable. Load Balancing routers split the traffic load amongst multiple internet connections, but they do not aid in reliability or increase speed. Failover and load balancing are useful features, but they are NOT the same as bonding.