Jupyter Notebook is an open-source web application that enables users to create and share documents containing live code, equations, visualizations, and narrative text. It serves as an interactive computational environment, allowing for data analysis, visualization, and machine learning across various programming languages. Originally developed as part of the IPython project, Jupyter has evolved to support multiple languages and is widely used in data science and academic research. Its user-friendly interface and ability to combine code execution with rich text make it a powerful tool for both beginners and experienced developers alike.