Heat Pump Defrost Question

https://zionnfzt160.slatecurrent.com/posts/warm-air-on-the-first-hot-day-means-north-fort-worth-ac-repair-and-a-call-to-comfort-experts

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