This scatter plot displays the population of the top 10 most populous countries in 2018, sourced from the United Nations World Population Prospects. Each circle represents a country, plotted along a linear population axis (formatted in billions) against a categorical country axis. The chart uses d3’s `scaleLinear`, `scalePoint`, `axisBottom`, and `axisLeft` APIs to construct the SVG visualization. Circles are rendered with a fixed radius, and gridlines extend from the x-axis ticks.