Motherboard – component of the PC that brings everything together, anything that needs processing will eventually have to contact the motherboard. The motherboard will also determine what CPU you can use, what memory, and almost all expansion options.
Processor – also known as the “Brain of the PC”. Processor is really just fast but not that smart. The speed of the PC is most often referring to the CPU rating, in MHZ (megahertz).
Memory – Memory Chips are what data resides in when it is being worked on by the CPU. Memory can have as much and sometimes more of an impact on performance as the CPU. Anything in memory goes away when the power is turned off.
Storage Devices - storage devices such as Hard Disk are the closet space of the PC. Unlike with the memory data stored on Hard Disk stays when the power is turned off. Hard Disk I/O speed to the CPU is much slower than memory. Other storage devices: magnetic drives like floppies, zip/jazz and other tape drives, optical drives like cd-rom’s, cd-r and cd-rw and DVD.
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