Heat Pump Defrost Question

https://telegra.ph/A-Comfort-Experts-Checklist-for-AC-Tune-Ups-and-Fewer-North-Fort-Worth-AC-Repairs-11-11

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