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CPU
This is what a the most common CPU's looks like:
AMD
Intel (Pentium 4)
The Bottom
Now when you look inside your computer you will not see you CPU it will be covered by a heat sink and fan. The reason for this is that the CPU will heat up some fast and hot it will fry itself. So it is the heat sinks job pull the heat from the CPU and then the fan blows the hot air away from the CPU
Heat Sink
Heat Sink with Fan