Heat Pump Defrost Question

https://trevorjfpx513.novacrestiq.com/posts/emergency-ac-repair-in-north-fort-worth-with-no-overtime-charges-at-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