This example shows multiple time series as colored lines, with each line representing a distinct category tracked over time on a shared axis. It uses D3 v6 to load a CSV dataset with `d3.csv`, group the data by category with `d3.group`, and render the lines with the `d3.line` generator. The visualization sets up a linear x-axis for years and a y-axis for values, applying a categorical color scale via `d3.scaleOrdinal`. The SVG is appended to a `div` container with explicit margins and dimensions, and axes are drawn using `d3.axisBottom` and `d3.axisLeft`.