Heat Pump Defrost Question

https://lukaseolt009.swiftnestly.com/posts/why-north-fort-worth-homeowners-choose-a-local-company-like-comfort-experts-for-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