A scatter plot displays the students-to-staff ratio for various countries, with each red circle representing a country's ratio plotted against the country name on the x-axis. The D3 v7 code loads CSV data from a GitHub Gist, then uses `d3.scaleBand` and `d3.scaleLinear` to map country names and ratios to SVG coordinates. Axis labels and rotated tick text clarify the chart, with the y-axis showing the ratio and the x-axis listing countries.