Understanding harddrive

I am hearing terms like motherboard, CPU, and hardrive. I think they all may be the same thing but am not sure. Can someone clarify this please and if they are not how do they relate to each other.
rozAsked:
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RazelConnect With a Mentor Commented:
Your motherboard, CPU and Hard Drive are three different parts of your computer which have three different jobs.
Your motherboard is what your Harddrive, expansion cards(sound card modem etc) processor, ram and everything plugs into.
Your CPU is aka Processor.  It Runs at a certaim Megahertz and processes everything your computer does.
Your hard drive is where all of your programs (windows) are stored.
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rozAuthor Commented:
Don't quite understand. Why does everything plug into motherboard? Is harddrive a card itself that is bought and installed? Find the definition of processor vague as I am pretty illerate in this area and don't know what my computer is doing. This may be too complicated if so I apologize.
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RazelCommented:
Your motherboard is a large electronic board.  It has connectors for all or your other components, and allows them to communicate with each other.
Your hard drive is not a card.  Most of them are about 3.5"X1"X5" metal casings over a metal disk, which stores your information.
They plug into your motherboards "Hard drive controller"  
The processor is the brains behind the whole computer.  Every thing you do on your computer goes through the processor to find out where to go or what to do. The higher the number of "megahertz" your processor is, the faster it "thinks"
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