This interactive bar chart visualizes the population of the top 20 countries for the year 2010. Built with React and D3 v5, the visualization maps country names to a categorical y-axis and population values to a linear x-axis, using SVG rectangles to represent each data point. The code utilizes `d3.scaleBand`, `d3.scaleLinear`, and `d3.format` to construct the axes and format tick labels, with hover tooltips displaying the population. Data is loaded asynchronously from a CSV file via `d3.csv`, and the chart is rendered using the React DOM, with axes and marks encapsulated as separate components.