The next component I am going to talk about is the Motherboard.
What is it: The motherboard is a printed circuit board that contain all of the circuits, sockets, plugs and power couplings needed to make the computer run. Basically, its where you plug everything in.
Where is it: Inside the chassis (which is what the tower/box/case is called) the motherboard is attached vertically along one of the long sides of the case so that the other components that plug into the motherboard have enough space without banging into the case or the other components, as well as having enough room for airflow to cool everything.
If you have any questions, please put them in the comments. Thank you.