Jupyter
Notebook environment that interleaves code, prose, charts, and outputs — the standard interface for data science.
Definition
Jupyter is a browser-based notebook environment where cells of code execute against a persistent kernel and display rich outputs inline. JupyterLab is the modern interface; the .ipynb format is the universal exchange. Jupyter is the standard tool for exploratory data analysis, model training experiments, and tutorials; most data work begins in a notebook before becoming production code.