This area chart shows car sales in Asia from 2009 to 2019, with a smooth line tracing the yearly sales trend and a grey shaded region beneath it highlighting the cumulative volume. The visualization uses D3.js v5 to load and parse CSV data from a GitHub gist, then applies a time scale for the x-axis and a linear scale for the y-axis to map the data points. The line and area paths are generated using d3.line and d3.area with curveBasis interpolation, while axisBottom and axisLeft render the labeled axes with formatted tick values.