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@MelissaBearTrix the quartz crystal is a very precise (as in: stable) electronic oscillator with the best stability vs power use vs size vs volume vs weight ratio for a watch (or a wall clock)given the time scale we're interested in (say minutes to months). On the time scale of a minute it is nearly the most precise oscillator one can have, and on the time scale of a month it only loses a few minutes or so, which is fine. There are other clock mechanisms (like mechanical pendulum clocks or atomic clocks or hydrogen masers or ...) that are way more precise over shorter (milliseconds) or longer time frames (years) but they are huge, take heaps of power, etc, and are not suitable as a watch that you need to wear on your wrist.
@davidtheeviloverlord @chu