Heat Pump Defrost Question

https://franciscovhxn519.fotosdefrases.com/ac-repair-for-heritage-homes-by-comfort-experts-in-north-fort-worth

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