This line chart displays temperature readings from San Francisco over the course of a week, with time on the x-axis and temperature on the y-axis. The visualization is built with React and D3 v7, using `scaleTime` and `scaleLinear` to map data, `d3.line` with `curveNatural` to draw the smoothed path, and SVG circles for data points. The code loads a CSV via `d3.csv`, includes native DOM title tooltips, and renders in a React component using `useData` and SVG elements.