This example shows a choropleth map of Indian states, with each state filled by a distinct color from a categorical scale. The map uses a Mercator projection and renders SVG paths via d3.geoPath. State boundaries are drawn from TopoJSON data loaded with d3.json, and each path includes a tooltip title showing the state name. The color scale is created with d3.scaleOrdinal and d3.schemeCategory10, while the SVG is selected using d3.select.