This bar chart displays the population of 20 countries in 2010, using a horizontal layout where bar lengths represent population values. Built with React and D3 v5, the visualization loads CSV data from a GitHub gist and renders SVG elements through custom ES6 modules. D3's `scaleBand`, `scaleLinear`, and `format` APIs handle axis positioning and tick labels, while interactive tooltips reveal precise population figures via SVG `<title>` elements.