This visualization displays the population of 20 countries as horizontal bars, with country names on the y-axis and population values on the x-axis. The SVG chart is rendered using React components alongside D3 scale functions and SVG elements. The code loads CSV data from a GitHub Gist, parses the population column, and uses `scaleBand` for the y-axis and `scaleLinear` for the x-axis. Axis ticks and labels are generated manually with D3’s `ticks()` method, while bars are drawn as `<rect>` elements.