This is a horizontal bar chart showing the population of 20 countries in 2020, rendered as SVG elements within a React application. The chart uses D3 version 5 scales (`d3.scaleBand` and `d3.scaleLinear`) to map country names and population values to positions and lengths. Data is loaded from a CSV file via a custom `useData` hook, with tick marks styled blue and a green fill for each bar. Tooltips display the formatted population value on hover.