Project Jupyter is an open-source initiative that provides tools for interactive computing and data visualization. It allows users to create and share documents that contain live code, equations, visualizations, and narrative text. This makes it particularly popular in fields like data science, education, and research. The most well-known component of Project Jupyter is the Jupyter Notebook, which supports various programming languages, including Python, R, and Julia. Users can run code in real-time, making it easier to explore data and present findings in a clear and engaging manner.