This example shows a line chart depicting the relationship between sleep hours and age for a small set of individuals. The visualization plots five data points on a Cartesian coordinate system, using a monotone curve to connect them in sequence. The chart is rendered with SVG and built using D3 v6, with d3.scaleLinear for the x and y axes, d3.line with d3.curveMonotoneX to generate the path, and d3.axisBottom and d3.axisLeft for the axes. The styling uses a steelblue stroke for the line.