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Power On/Off Switch
The power on/off switch for modern PCs is on the front of the case. (Older PCs, using the PC/XT or AT desktop form factors, have no power switch on the case at all; the case is designed so that the on/off switch of the power supply is accessible directly through a hole in the case, usually at the rear.)
On most Baby AT form factor cases, the power button doesn't in fact do anything other than mechanically transfer the "push" of your finger to the real metal or plastic power supply switch that is behind it. That remote switch is in fact part of the power supply, and so is discussed in that section. Newer form factors, including the ATX family, NLX and WTX, have a true power switch on the case, which is connected to the motherboard. The motherboard on these systems turns on and off the PC, not the power supply directly.
Next: Reset Button