This example visualizes population data from 1997 to 2005 using a combined line and area chart. It renders the population trend as a smooth curve (via `curveBasis`) with a yellow filled area beneath it, while labeled axes show year and population values. The code uses D3 v5 APIs including `scaleLinear`, `axisBottom`, `axisLeft`, `line`, and `area` generators. Data is loaded from a CSV file and rendered as SVG, with axis ticks formatted using D3’s `format` function.