Heat Pump Defrost Question

https://elliotnnfa083.ironwoodscope.com/posts/a-comfort-experts-checklist-for-ac-tune-ups-and-fewer-north-fort-worth-ac-repairs

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