This bar chart displays total vaccination counts by manufacturer across selected countries as of May 19, 2021, with Pfizer/BioNTech leading at over 235 million doses. The visualization uses d3.scaleLinear and d3.scaleBand to map vaccination values and manufacturer names, while d3.axisBottom and d3.axisLeft generate the axes. Rendered as an SVG with d3.v5, the chart features interactive tooltips that appear on hover, showing exact vaccination numbers via the D3 mouse event handlers. The data comes from a CSV file loaded with d3.csv.