Heat Pump Defrost Question

https://remingtonqgmk866.silverstonebrief.com/posts/comfort-experts-explains-strange-ac-noises-and-ac-repair-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