A horizontal bar chart displays the number of engines for various commercial aircraft models, from single-engine PC-12s to four-engine A340s and B747s. The visualization uses D3 v5 with an SVG renderer, reading aircraft and engine counts from a CSV file. It employs `d3.scaleLinear` for the x-axis, `d3.scaleBand` for the categorical y-axis, and `d3.axisLeft` and `d3.axisBottom` to generate labeled axes with gridlines.