A is a group of connected together so they can send data to each other. Your phone, laptop, school computers, and even smart home devices are all part of networks.
When devices are connected, data travels along a from one device to another. The way devices are arranged and connected is called the network's topology.
Think about it: how would you connect 5 computers together? You could connect them all to one central computer. You could connect each one to the next in a chain. You could connect every computer to every other computer. Each approach has different tradeoffs in cost, speed, and reliability.
Bandwidth
The maximum amount of data that can be sent over a connection in a fixed time. Higher bandwidth means faster data transfer.
Redundancy
Having more than one path between devices. If one path fails, data can use another route.
Fault Tolerant
A system that can continue working even when some of its parts fail.
Path
The route that data takes from one device to another across a network.