This area chart shows global population growth from 1960 to 2015, with the x-axis mapping time and the y-axis mapping population in billions. The chart uses a smooth curve to fill the area beneath the population trend line, with grid lines and labeled axes for readability. It is built with D3 v7, using `scaleTime`, `scaleLinear`, `area`, and `curveBasis` to generate the SVG path. Data comes from a CSV of world population by year hosted on VizHub.