This example displays the relative frequencies of letters in the English language as horizontal bars, sorted from most to least frequent. It uses a linear x-scale (d3.scaleLinear) to map frequency values to pixel widths, with each bar’s height fixed at 10 pixels and positioned vertically by index. The chart renders as an SVG element appended to the page body, with data loaded from a local CSV file via d3.csv, parsed, and sorted in descending order before drawing. The visualization is built with D3 v4.