"The Jupyter Notebook is an open-source web application that allows you to create and share documents" Project Jupyter
"documents that contain live code, equations, visualizations and narrative text." Project Jupyter
"Uses include: data cleaning and transformation, numerical simulation, statistical modeling, data visualization, machine learning, and much more." Project Jupyter
"When you save it, this is sent from your browser to the notebook server, which saves it on disk as a JSON file with a .ipynb extension." Architecture - Jupyter Projects