This bar chart displays population figures for 30 countries in 2020, using a horizontal layout where each bar represents a country and its length encodes population size. Built with React and D3 v5, the visualization uses `scaleBand` for the categorical y-axis, `scaleLinear` for the quantitative x-axis, and SVG `rect` elements for the bars. Data is loaded from a remote CSV file via D3’s `csv` function, with population values converted from strings to numbers. Custom axis components render tick marks and labels, and tooltips show the formatted population value on hover.