Heat Pump Defrost Question

https://remingtontdcb407.westhavenscope.com/posts/water-heater-repair-and-ac-repair-under-one-call-in-north-fort-worth-through-comfort-experts

Heat Pump Defrost Question Is it normal for a heat pump to blow steam from the outdoor unit in winter? Ours did that during the freeze last February and I panicked a bit. Sounds like it might just be the defrost cycle from what I'm reading here