A bubble chart maps the top 250 IMDB movies by release year (x-axis) and runtime in minutes (y-axis), with circle size encoding rating and color distinguishing simplified genres. The D3 v7 code uses a linear scale for axes and radius, an ordinal color scale from `schemeSet2`, and renders axes via `axisBottom` and `axisLeft`. Data is parsed from a CSV, with runtimes converted from strings like "2h 22m" to minutes. React manages the SVG lifecycle, passing filtered data to the `viz` function.