Virtual Router Redundancy Protocol (VRRP) allows several routers to work together and present themselves as a single 'virtual' router to the hosts on the network. This provides high availability by allowing another router to take over quickly if the primary router fails, without requiring reconfiguration of the host devices. By contrast, each router acting as a standalone device cannot provide the same level of redundancy because if one router fails, the host configurations would need to be changed to communicate with another router.