What is a specialized device that allows multiple networks?
What is a specialized device that allows multiple networks or multiple parts of one network to connect and exchange data?
A router is a device that acts as connection between two different networks. In this case, the cable company has one network, which includes your Internet Connection. The network is your home computer or computers. The cable router allows these two networks to connect with each other and share information.
A router is a device that forwards data packets along networks. A router is connected to at least two networks, commonly two LANs or WANs or a LAN and its ISP's network. Routers are located at gateways, the places where two or more networks connect, and are the critical device that keeps data flowing between networks and keeps the networks connected to the Internet.
It isn't, it is the same thing. The term 'Gateway' is used to depict the device that allows you to connect to devices outside of your network, as in you walk through a gate into the outside world. Fancy mumbo-jumbo really, just another word for the same device. Routers connect different networks, they route traffic between them. You can call them whatever you want, still the same device and the same function.