A bubble chart displays FIFA World Cup data, mapping tournament years on the x-axis, the number of participating teams on the y-axis, and bubble size to total attendance. Bubble color encodes the number of games played, using a viridis sequential color scale. The D3 v7 code creates an SVG with linear and band scales, square-root scaling for radii, and includes axes, titles, and legends. Data is loaded from a remote CSV file via `d3.csv`.