A horizontal bar chart displays total medal counts for twelve countries in the Tokyo Olympics, with country names on the y-axis and medal totals on the x-axis. Built with React and rendered as SVG, the visualization uses D3's `scaleBand` for the categorical y-axis and `scaleLinear` for the numeric x-axis. Data is loaded asynchronously from a CSV file via `d3.csv`, and bars are drawn as `rect` elements with a green fill.