This example visualizes student marks as a bar chart using React and D3. It shows the total marks for each student, with bars encoded by height on a linear scale and names on a band scale. The code fetches CSV data from a remote URL, parses it, and renders an SVG with rectangular bars using `scaleBand` and `scaleLinear`. It leverages React’s `useState` and `useEffect` for data loading, and D3’s `axisBottom` and `axisLeft` for axes. The chart uses a green fill for bars and includes margins and a title, with no interactive or animated behavior.