Heat Pump Defrost Question

https://reidomue525.vantagequill.com/posts/comfort-experts-explains-capacitor-and-contactor-failures-in-north-fort-worth-ac-repair

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