This example displays a horizontal bar chart of the ten most populous countries, ranking them by their 2019 population figures. The visualization uses React hooks to fetch and manage CSV data via `d3.csv`, while rendering rectangles and axes as SVG elements. D3’s `scaleBand` and `scaleLinear` map country names and population values, with custom tick marks drawn through explicit loops rather than axis components. The code imports `axisLeft` and `axisBottom` but does not use them, instead manually positioning labels and lines for a lightweight, instructional implementation.