This area chart visualizes the world population in 2015 across leading countries, using the data source from Data Canvas Sense your City. The chart displays population counts over time with time-series data, rendered as a smooth filled area using an SVG path. The visualization employs d3.scaleTime and d3.scaleLinear for axes, d3.area with curveBasis for the area generator, and d3.axisLeft and d3.axisBottom for labeled ticks, with formatting applied for population values.