Jupyter Notebooks are open-source web applications that allow users to create and share documents containing live code, equations, visualizations, and narrative text. Structured as a sequence of individual cells, a notebook enables the independent execution of code snippets, with outputs displayed directly beneath the cell that produced them. This interactive, cell-by-cell execution model makes Jupyter an exceptionally powerful tool for iterative data exploration, numerical simulation, statistical modeling, and machine learning, establishing it as a staple in the fields of data science and scientific computing.