This visualization presents salary data as a heatmap, using color intensity on a linear scale from light gray to blue to represent salary amounts in US dollars across job titles and company sizes. The SVG chart employs D3 v7 with `scaleBand` for the categorical axes and `scaleLinear` for the color mapping. Hovering over individual rectangles triggers a tooltip displaying the exact salary value, while a legend with axis ticks and color rectangles provides a visual reference for the salary scale.