In packet-switched networks such as the Internet, a ( ) is a device or, in some cases, software in a computer, that determines the next network point to which a packet should be forwarded toward its destination. The ( ) is connected to at least two networks and decides which way to send each information packet based on its current understanding of the state of the systems it is related to. A ( ) is located at any gateway (where one network meets another), including each point-of-presence on the Internet. A ( ) is often included as part of a network switch.