I had the same problem; This cleared it up: http://jupyter.org

I actually thought this was some kind of laptop for awhile, even after reading much of the front page. I googled Jupyter Notebook after a few context clues finally tipped me off. I just thought I was being dense, though.

[msft] Yes, we should improve the FP, especially for those who aren't familiar with Jupyter. Meanwhile, I hope this answers a few q's:

https://notebooks.azure.com/faq