This bar chart displays the relative frequency of each letter in the English alphabet, sorted from most to least common, with percentage labels above each bar. The data originates from Wikipedia’s letter frequency statistics. Built with D3.js v7, it uses `d3.scaleBand` for the categorical x-axis, `d3.scaleLinear` for the y-axis, and the `d3.groupSort` function to reorder the letters by descending frequency. Axes are rendered via `d3.axisBottom` and `d3.axisLeft`, with bars colored steelblue and value labels overlaid.