This line chart shows world population from 1950 to 2020, with years on the x-axis and population on the y-axis. The visualization uses D3 v5’s `scaleTime`, `scaleLinear`, `axisBottom`, `axisLeft`, and `line` generators to render an SVG path, with gridlines and labeled axes. Data is loaded as CSV from a GitHub gist, and the chart includes a title and axis labels styled via external CSS.