Your computer has a slice of rock in it that moves back and forth when you run electricity through it. It counts the number of times it moves back and forth, and it knows how many times it moves back and forth in one second. When it has moved back and forth the correct number of times, it knows one second has passed.
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To answer the single most asked question: When the power is off, there is a small battery on the motherboard that provides enough power to run the quartz timer, which is known as the CMOS battery. When that battery dies or is removed, the time will reset to a default value every time the computer loses power.
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