eli5 what’s the difference between a regular clock and an atomic clock?

Question

eli5 what’s the difference between a regular clock and an atomic clock?

In: 26

Answer 1

The official scientific standard for 1 second is the time interval of 9192631770 vibrations of radiation corresponding to the transition between two hyperfine levels of the ground state of cesium 133.

So an atomic clock is that precise versus something mechanical like precision gears and springs.