A device in a subnet needs to send a packet to a device in a different subnet. To which device will it address the outgoing packet?

The Router

Explanation:

A router is a layer 3 device in the OSI network model. As the name implies, it routes packets logically from source to destination. An interface in a router represents a segment or a configured stand-alone network, with a specific subnet mask.

Routers have routing tables that learns a network route statically or dynamically with protocols. When a packet is to be sent to a device in another network, the router receives the packet and forwards the traffic to the destination (through another interface, if connected directly) or to the next hop router interface alone the path to the destination.