This bar chart displays the top 10 countries by population for 2020, using a horizontal layout where each bar’s length encodes population values on a linear scale. The visualization is rendered as SVG in a React component, with D3 v5 utilities (scaleBand, scaleLinear, max, csv) handling data loading, scaling, and axes. The dataset is fetched from a CSV file of UN population estimates, and React state (useState, useEffect) manages the asynchronous data loading, while the Marks component draws each rectangle bar.