This horizontal bar chart displays the top 10 most populous countries, ranking them by their 2020 population estimates. The visualization is built using a React front-end with D3.js v5 for data processing and SVG rendering. The code employs d3.scaleBand for the categorical y-axis, d3.scaleLinear for the continuous x-axis, and the csv function to load data from the United Nations World Population Prospects 2019 dataset.