A line chart displays temperature over time across a week in San Francisco, using a smooth curved path and circular markers for each data point. The visualization is built with React and D3 v5, leveraging `scaleTime` and `scaleLinear` for axes, `line()` with `curveNatural` for the path, and `csv()` to load the dataset. SVG renders the chart, with tooltips showing the day for each circle via `timeFormat`.