This example visualizes the population of ten countries in 2022 as a horizontal bar chart. It uses React for component structure and state management, while D3 v5 handles data loading via `d3.csv` and scales (`scaleBand`, `scaleLinear`). The chart renders to SVG, with custom tick marks and grid lines manually drawn instead of using `axisBottom` or `axisLeft`. Data comes from a GitHub Gist containing country population figures.