The Parts of a Computer
The hard drive stores all the long term memory.
The system fan cools all the components as they heat up when they work.
The CPU runs the whole computer, it does all the nitty gritty stuff like calculations.
The RAM Modules store all the short term memory, like your latest mouse click or keyboard touch.
The Optical Drive is where you put in your cd's and dvd's to plat them or burn stuff onto them.
The Heatsink is located on top of the CPU to cool it so it doesn't break.
The Power Supply is of course the thing that gives the computer it's power so it can work.