This bar chart visualizes the top 10 most populous countries in 2018 using data from the United Nations World Population Prospects 2017. The example demonstrates a minimal D3.js v5 setup, reading from a CSV file and rendering rectangular bars as SVG elements. The code uses `d3.csv` to parse the data, `d3.scaleLinear` for scaling, and appends SVG `rect` elements with `steelBlue` fill. While the bar heights are fixed at 300 pixels in the visible code, the structure shows how D3 binds data to graphical primitives.