Seaborn

Seaborn wraps Matplotlib with statistical-plot-specific defaults — a single line produces a proper box plot, heatmap, or distribution plot with sensible styling, where the equivalent in raw Matplotlib takes considerably more manual configuration.

It works directly with Pandas DataFrames, passing column names as arguments rather than extracting arrays first — a natural fit once your data is already in a DataFrame, which for statistical/exploratory plotting it usually is.