A bubble chart displays the relationship between market capitalization and employee count for major tech companies, with circle size encoding market cap and color distinguishing industry sectors. The visualization uses d3.scaleLinear for both axes, d3.scaleSqrt for circle radii, and d3.scaleOrdinal with d3.schemeSet2 for categorical coloring. Axes and legend are rendered via custom modules, while the SVG output loads data from a static CSV file using d3.csv.