This example renders a bar chart of student marks using React and D3 v5. It uses `d3.scaleBand` for the x-axis and `d3.scaleLinear` for the y-axis, with React’s `useState` for data management. The visualization maps each student’s total marks to bar height, using color as an additional channel to distinguish data categories. The code creates SVG elements dynamically through React’s rendering system while leveraging D3’s scale functions for layout and positioning.