This circular heat map visualizes the relationship between four categories and twelve months, with each cell’s color intensity encoding the numeric value. The chart is composed of concentric rings, one per category, split into twelve angular segments for each month, creating a compact radial layout. Color mapping uses a linear blue scale from white to a dark navy (#01579b). Hovering over any cell triggers a tooltip displaying the exact month, category, and value. The visualization is implemented in D3.js v3 using SVG, with the circular layout emphasizing cyclical patterns in the data.