This example generates a multi-series bar chart with rows from a CSV file, displaying up to 11 columns of data as vertical bars. The visualization uses D3 v5 APIs such as `scaleLinear`, `scaleBand`, `axisLeft`, `axisBottom`, and `axisRight` to render axes and bars. Invisible overlay rectangles detect mouse movements and trigger tooltips that show corresponding values from each series, while interactive hover states highlight the bars. The implementation uses SVG for rendering and includes animated transitions for chart updates.