Heat Pump Defrost Question

https://arthurqwzn796.image-perth.org/electrical-panel-problems-behind-ac-repair-in-north-fort-worth-and-where-comfort-experts-fits-in

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