Heat Pump Defrost Question

https://shanekfrx461.zenbloomer.com/posts/storm-and-power-outage-advice-from-comfort-experts-for-ac-repair-in-north-fort-worth-neighborhoods-3

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