Jupyter is an open-source web application for creating and sharing documents that contain live code, equations, visualizations and narrative text. It started as the IPython Notebook in 2010 and became an independent project in 2014. This document discusses Jupyter Notebook architecture and two Jupyter notebook extensions - Jupyter_code_cell_status and Jupyter-multi_outputs. It explains how these extensions work and their features, such as displaying code cell status and handling multiple outputs from code cells. The document encourages contributions to Jupyter via GitHub pull requests and developing new notebook extensions.