A simple bar chart displays the frequency of named categories A through I, using a vertical layout with an ordinal x-axis and linear y-axis. The bars are colored steelblue and turn brown on hover. The visualization is rendered with D3 v3, loading data from a JSON file and using `d3.scale.ordinal` and `d3.scale.linear` to map values. Axes are generated with `d3.svg.axis`, with rotated x-axis labels. The chart is built with SVG `rect` elements appended to a grouped SVG container.