This example shows a line chart tracking sales over time. It plots the monthly sales figures from a CSV file, with a line connecting data points and small circles marking each value. The chart is rendered as an SVG using D3.js, specifically employing `d3.scaleTime`, `d3.scaleLinear`, and `d3.line` to map the data. The source data is loaded via `d3.csv` from a GitHub Gist.