What Is Jitter on Oscillator? Why Is It so Important for Electronic System?

https://www.xtaltq.com/news/what-is-jitter-on-oscillator-why-is-it-so-important-for-electronic-system.html

In the context of high-precision crystal oscillators, crystal oscillator jitter is a critical parameter that measures the deviation in the timing of the clock signal from its ideal periodicity. It is typically expressed in terms of picoseconds (PS) or femtoseconds (FS).