This example visualizes monthly air passenger counts from 1949 to 1960 using a stacked area chart. Each colored band represents a year, with the x-axis showing months 1–12 and the y-axis displaying total passenger counts across all years. The visualization uses d3.stack, d3.area, and d3.scaleOrdinal with the schemeCategory10 color palette, processing data from an external CSV file. The SVG rendering includes axes, labels, and a legend that maps colors to years.