This bubble chart visualizes the relationship between market capitalization and employee count for major technology companies, with bubble size encoding market cap and color representing industry sector. The chart uses D3's scaleLinear for both axes, scaleSqrt for radius mapping, and scaleOrdinal with schemeSet2 for categorical colors. Data is loaded via d3.csv and rendered as SVG circles using the join operation. A custom legend renders colored rectangles with industry labels alongside the plot.