The route defines the traffic flow. All traffic from the associated subnet will follow the route defined by these rules. If we define that traffic will go to the internet, all traffic will go outside the network to an IP address range defined with an IP address prefix. If we choose that traffic goes to a virtual network, it will go to a subnet defined by the IP address prefix. If that virtual network gateway is used, all traffic will go through the virtual network gateway and reach its connection on the other side, either another virtual network or our local network. The virtual appliance option will send all traffic to the virtual appliance, which then, with its own set of rules, defines where the traffic goes next.