This line chart shows monthly sales figures across a calendar year, with a smooth curved line connecting twelve data points from January through December. Users can hover over any circle marker to see a tooltip displaying the exact month and sales value. The visualization uses D3 v7 with SVG rendering, employing d3.scaleLinear for the x and y axes, d3.line with curveMonotoneX for the path, and d3.csvParse for loading the embedded dataset. Axis labels clarify the month and sales dimensions.