This heatmap visualizes career data from a CSV file, using color intensity to represent values across two categorical dimensions. The chart employs `d3.scaleBand` for axes, `d3.scaleSequential` with the `d3.interpolateInferno` color scale, and SVG rectangles for cells. A tooltip appears on hover to show exact values. The cells are made draggable through `d3.drag`, and during a drag, all rectangles in the same group turn red, highlighting their column.