Can someone tell me the difference between Soy and Whey protein?

I am looking into the soy protein products to supplement my Baritec and Nectar protein supplements. I was looking for coffee that I could make into an ice coffee for warmer weather. I found Revival Soy Coffee that claims soy will help with menopausal issues such as dryness. I am realy confused at the difference between soy and whey and if it matters what we use. Thanks in advance for any answers!

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