A pie chart visualizes the proportional use of 22 major languages in India, with counts in millions. The D3.js visualization orders slices by value and displays a tooltip on hover showing the language name, its count, and calculated percentage of the total. Data is hardcoded in the `index.js` file, and the chart is rendered as a static SVG without animation. The code uses `d3.arc`, `d3.pie`, and `d3.scaleOrdinal` with a categorical color scheme, plus a custom legend built from the same color domain.