This bar chart displays the top 10 most populous countries for the year 2020, using data from the United Nations World Population Prospects 2019. The visualization uses a horizontal bar layout, where each bar’s length encodes population, with a formatted axis label converting values into a readable "B" (billions) format. Built with React and D3 v5, the code constructs a linear scale (`d3.scaleLinear`) for the x-axis and a band scale (`d3.scaleBand`) for the categorical y-axis. The rendering is SVG-based, with interactive tooltips showing exact population values on hover. The chart is styled with a teal color for bars and a clean sans-serif font, presenting the data in an accessible, static format.