The project is currently (this month) moving from it's previous incantation called 'IPython'* to 'Jupyter'. The website apparently hasn't catched up yet. This

The project is currently (this month) moving from it's previous incantation called 'IPython'* to 'Jupyter'. The website apparently hasn't catched up yet. This is the description you're looking for: http://ipython.org/notebook.html http://ipython.org/notebook.html * = http://ipython.org/ http://ipython.org/