A communication processor that connects dissimilar networks by providing the translation from one set of protocol to another is
A communication processor that connects dissimilar networks by providing the translation from one set of protocol to another is Gateway.
A gateway is a node (router) in a computer network, a key stopping point for data on its way to or from other networks. Thanks to gateways, we are able to communicate and send data back and forth. The Internet wouldn't be any use to us without gateways (as well as a lot of other hardware and software).
While forwarding an IP packet to another network, the gateway might or might not perform Network Address Translation. A gateway is an essential feature of most routers, although other devices (such as any PC or server) can function as a gateway.