This line chart visualizes temperature variations in San Francisco over a week. The SVG renders a smooth curve using d3.line with curveBasis, plotting timestamps against temperature values. Axes are created with d3.axisBottom and d3.axisLeft, including gridlines and rotated axis labels. The data is loaded from a CSV file, parsed for temperatures and dates, then scales are set using d3.scaleTime and d3.scaleLinear.