Heat Pump Defrost Question

https://troytuco030.alderbrief.com/posts/smart-thermostat-setup-tips-from-comfort-experts-to-reduce-ac-repair-in-north-fort-worth-homes

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