An area chart displays world population from 1950 to 2015, using a smooth basis curve to fill the space beneath the line. The visualization loads data from a CSV file and renders it with D3.js v5, using `scaleTime` for the x-axis, `scaleLinear` for the y-axis, and `area` with `curveBasis` for the shaded region. Grid lines and axis labels are drawn via `axisLeft` and `axisBottom`. The title and axis texts are styled using CSS classes.