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A computer's clock signal is typically generated using oscillating crystals. The resulting clock signal is sometimes multiplied to higher frequencies or divided to lower ones, as needed by the hardware.

Many computers also include a real time clock chip (RTC). This is permanently powered (using a small battery to continue running when the power is off). The RTC chip produces information about the current time of the day by counting seconds (or fractions of seconds). Those units are derived from a very reliable clock signal, typically derived from an oscillating crystal.

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