This bar chart shows total COVID-19 vaccination counts by manufacturer across given countries, as of May 19, 2021, with Pfizer/BioNTech leading by a wide margin. The visualization uses D3 v5’s `scaleLinear`, `scaleBand`, `axisBottom`, and `axisLeft` to map vaccination numbers to bar lengths along a log-free linear scale, with a custom `.tickFormat` for compact labels. Horizontal bars are rendered as SVG rectangles, and the data is loaded from a CSV file via `d3.csv`.