Seriously, I've read about it's a website prototyping tool, and all the promotional material that goes with it, etc but I am none the wiser as to what the actual end product is that I can create?
Can I create a fully functioning website that I can actually upload/have hosted on a server? If so, is this a replacement for Dreamweaver? If not, what's the point?
It's a prototyping tool. The end product is that your client signs off on the design you're proposing. At that point you could start development from scratch, and use the XD prototype as the design document, or you can export PNGs of all of the graphics, at 1x, 2x, and 3x sizes (plus the HiDPI variations for Android) for your developers to use. That would save going back to Photoshop or Illustrator and having to export each element.
There is currently no way to export the interaction, and as I understand it no near future plans. If you go to this page and search for "export interactive" you will some of the related feature requests, and you could vote for the ones you're interested in:
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