This stylized bar chart visualizes the top ten countries by population, using horizontal bars where length encodes the population value. Built with React and rendered as SVG, it fetches UN Population 2019 data via the `d3.csv` utility, and uses React state to load and store the dataset. The chart’s axes are generated with `d3.scaleLinear` and `d3.scaleBand`, while custom React components (`AxisBottom`, `AxisLeft`, and `Marks`) draw the ticks and rectangles. A hover tooltip, formatted with `d3.format`, displays the population value in billions, and the chart’s styling uses the Poppins font and a teal color scheme.