A choropleth map displays the estimated number of Samsung users per country using a blue sequential color scale, with tooltips revealing exact values on hover. Built with D3.js v7, it loads world geometry via `d3.json` and TopoJSON, joins ISO codes from a TSV, and reads user data from a CSV. Countries render as SVG paths through `d3.geoPath` and a Natural Earth projection, while a CSS-styled tooltip animates opacity using `transition().duration()`. The map focuses on a subset of 20 listed countries, leaving others gray.