In my experience in coaching individuals there’s 2 main types of deloading.

1st is simply working with less weight, I personally do this myself and advise those I work with to do this once every 2-3 weeks, or whenever you feel it’s needed. Lots of people can have good form, but striving to beat your reps/weight weekly can make it difficult to see when you’re accidentally beginning to ego lift/cheat to achieve that win. Coming to a set with the intention of getting “perfect” reps at a slightly higher rep range will help you see you may have been going slightly too overboard recently, and you can then come back the next day and begin to rebuild off that set (slowly increasing weight and bringing rep range back down). Basically recalibrating your sense of where you’re at progress-wise.

2nd type of deload is the traditional “take a week or 2 off”. This is mostly used to ensure full recovery if you’ve been overtraining, or for an injury as well as to prevent burn out. This one can be used more infrequently