Computer networking used to be only for corporations. But they are now affordable for personal use. It allows you to access multiple computers, printers and wireless devices effortlessly. You can transfer documents and files including media files (music and video) throughout your home.
Some might say "why do I need computer networking"...
Let's say you downloaded a song on your desktop computer and you would like to listen to it on your laptop. Instead of re-downloading, you can transfer it through your network. It is very beneficial to those who often work from home as well.