A bar chart displays population estimates for nine countries using horizontal bars, with country names on the y-axis and population values on the x-axis. The chart is rendered as SVG in a React framework using D3 v5 APIs including `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom`. Data is loaded from a CSV file and appended as `rect` elements inside a grouped `<g>` element with margins.