Depends on the type of movement. Mechanical watches uses a wound-up spring to provide the power that drives the gears and escapement. Quartz watches typically rely on a battery, which powers a small electronic circuit which involves a quartz crystal to keep time.
Crestside
Analog movements can be either quartz or mechanical, but all digital watches have quartz movements. With respect to watches, an analog movement can be quartz or mainspring. Analog refers principally to how the time is displayed - by the use of hands. All digital watches have quartz movements, meaning the time is kept by the counting of pulses generated by a quartz crystal at a precise frequency, and displaying the time as digits. Analog watches are mostly digital these days also, using a quartz crystal to generate pulses, counting those pulses digitally with bit counters, then electrically triggering the mechanical movement each second (or equal portion thereof). Mainspring watches are all analog. They use a mechanical clock movement driven by a mainspring to move the hands. Accuracy is determined by the period of a hairspring flywheel spinning back and forth, allowing the movement to progress a fraction of a second with each half cycle. Automatic movements use an unbalanced flywheel to wind the mainspring automatically as the watch is worn and moved on the wearer's arm.
Chronographs/stopwatches are only made to time a certain limit. For digital watches, it can be up to as many digits as the digital watch can display, or limited by the manufacturer. For analog watches, it's only as far as the complexity of the mechanism. Some examples of analog watch chronograph limits can be 30 minutes, 1 hour, 12 hours, or even 24 hours.
with a magic wand
-- levers -- wrenches -- stop-watches
Analog watches have dials, whereas digital watches have a numerical readout.
The advantages of an analog watch over a digital watch are that analog watches can be more durable in some facets, than a digital one. Many watch enthusiasts also feel that analog watches are more aesthetically pleasing than digital watches.
Analog.
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On analog watches, in other words, non-digital watches, there are "hands," the things that point to the numbers.
Analog is a clock with the moving hands on it, while digital is computer generated numbers.