This interactive D3 v7 visualization presents the hierarchy of programming languages using a custom four-layer tree layout, grouping languages by family, paradigm, and name. The visualization uses SVG rendering with animated transitions between node states, where each layer is distinguished by color and geometric shape (circles, squares, diamonds, and triangles). The data is either embedded directly or loaded from a CSV file, with the layout computed through D3's tree and stratify modules, and rendered using custom link paths and node labels with a fixed tooltip.