Heat Pump Defrost Question

https://cesarvmck284.brightpathdigest.com/posts/getting-your-ac-ready-for-summer-with-a-comfort-experts-plan-to-avoid-north-fort-worth-ac-repair-calls-4

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