A line chart displays temperature readings over one week in San Francisco, with red circles marking each data point and a smooth steelblue curve connecting them. The visualization uses D3 v5 with SVG rendering, employing `scaleTime` and `scaleLinear` for the axes, `axisLeft` and `axisBottom` for tick marks, and a `line` generator with `curveBasis` for the smoothed path. Data is loaded from a CSV file via `d3.csv` and parsed into timestamp and temperature values.