This line chart visualizes monthly sales growth from January 2021 to January 2025 using a smooth monotone curve. The SVG rendering relies on d3.scaleTime, d3.scaleLinear, d3.line with curveMonotoneX, and d3.axisBottom/axisLeft, with data loaded via d3.csv from sales_trend.csv. Orange circles mark individual data points, while labeled axes and a title clarify the upward trend.