This bar chart displays the top 10 countries by projected population for 2020, using data from a UN Population 2019 CSV file loaded via `d3.csv`. The visualization uses React with SVG rendering, where `d3.scaleBand` maps country names to vertical positions and `d3.scaleLinear` maps population values to horizontal bar lengths. Gridlines and axis ticks are generated through `xScale.ticks()`, with the chart sized to the browser window dimensions.