Heat Pump Defrost Question

https://daltonzdfs706.theglensecret.com/signs-your-ac-needs-repair-in-north-fort-worth-before-you-call-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