Answer:
A home computer network is a connection of computers on a house. If you have more than one computer is possible to make them communicate through a network and pass files from one computer to another. Also you are able to print from one computer to another if you have a printer on a computer and the other doesn't by choosing a printer on the network.
There are a lot of routers that have for more than one computer and that way you can create a network (A router is a box that you get if you have DSL or Cable internet). You can also buy a HUB to create a bigger network (add more computers) and with that you can create a network.
If you only have one computer or you don't pass files from one computer to another or don't print from one computer to another than a network is useless. There's four computers here in my house and I don't use a network because I really don't need it (although I use to).