This bar chart visualizes the top 20 countries by confirmed COVID-19 cases, using horizontal bars to compare population metrics. The visualization is built with React and D3 v5, leveraging `d3.csv` to load the dataset and `d3.scaleBand`/`d3.scaleLinear` for axis scaling. SVG elements are rendered declaratively through React, with `rect` marks for bars and text grids for tick labels, displaying both chart axes and data directly from the raw CSV file.