This example presents two charts built from a CSV file of car performance data: a multi-series line chart that plots each of the first three quantitative columns against the sample index, and a combined bar-plus-line chart. The line chart uses `d3.line` and `d3.scaleLinear` with a category color scheme, while the combo chart overlays bars and lines. The code loads data via `d3.csv` and renders both SVG charts.