A line chart displays the world population from 2010 to 2020, with the year on the x-axis and population count on the y-axis. The visualization uses React and D3 v7, with `d3.csv` to load data from a GitHub gist, `d3.scaleTime` and `d3.scaleLinear` for axes, and `d3.line` with `curveBasis` for the smoothed path. SVG renders the chart, including custom axes with tick labels and axis titles, styled according to the CSS in the HTML file.