When signal processing is timed to the pulse of the track, everything in the mix sounds a lot smoother. It’s applicable to compressors, delays, modulators, and especially reverb. The two parameters that are adjusted for timing are the decay time and the predelay.
When reverb is timed to the pulse of the track, it seamlessly adds depth and makes the mix sound more polished. To time the decay time to the track, trigger the reverb with the snare and adjust the decay parameter so that the decay just dies by either the next snare hit or a later one. The idea is to make the decay “breathe” with the track.
Read more about this here: https://bobbyowsinskiblog.com/2019/07/17/reverb-timing/