This interactive scatter plot from the D3.js gallery visualizes country-level happiness data from the UCI Machine Learning Repository. Two dropdown menus let users select which columns from the happiness.csv dataset map to the X and Y axes, with the plot updating via smooth, staggered transitions. The visualization uses D3 v5’s `scaleLinear`, `axisBottom`, `axisLeft`, and `select` APIs, rendered as SVG circles with animated positioning and axis labels that update dynamically.