This example visualizes temperature readings over time from a CSV file as a line chart with overlaid circles marking each hourly data point. The code uses D3 v5 modules including `scaleTime`, `scaleLinear`, `line`, `axisLeft`, and `axisBottom` to render an SVG graphic. The temperature data is parsed, sorted, and scaled to fit within a 960×500 SVG canvas, with axes generated via D3’s axis components. The chart demonstrates fundamental D3 data-join and DOM manipulation techniques for creating and styling SVG elements.