Can you discuss some of the terminologies commonly used in networking?

"Some of the key terms you need to know when discussing networking include:
Network - A system of computers and related technology connected together to communicate and share information.
Protocol - The instructions or guidelines used to establish communication between devices on a network.
Link - The physical connection between the devices in a network.
Node - Each independent device on the network.
Gateway - A device used to control the traffic between two independent networks.
Router - A device that acts as a switch and processes network traffic using routing protocols.
Unicasting - Sending information from one device to another specific device.
Multicasting - Sending information from one device to multiple devices on the network.
Broadcasting - Sending information to all devices on the network."