This example shows a vertical bar chart of lettered categories (a–m) and their corresponding numerical values, with red bars and labeled axes. The chart uses D3 v5 to load comma-separated data via `d3.csv`, then applies `d3.scaleBand` for the x-axis and `d3.scaleLinear` for the y-axis. Axes are rendered with `d3.axisLeft` and `d3.axisBottom`, and the bars are appended as SVG `<rect>` elements. The layout uses a fixed margin and inner dimensions, with the y-axis range inverted to align zero at the bottom.