This bar chart displays the population of ten countries in the year 2000, using a horizontal layout where each bar's length corresponds to the population value. The visualization uses D3 v5's `scaleBand` for the categorical country axis and `scaleLinear` for the population axis, rendering marks as SVG rectangles. Tooltips show formatted population values (using D3's `format` with SI prefixes like "B" for billions). The data is loaded from a remote CSV file using D3's `csv` function, with the population values computed by multiplying the raw 2000 column by 1000. React manages the component state and rendering, with custom `AxisBottom` and `AxisLeft` components generating the tick marks and labels.