This example displays a 3D bar chart of student marks across four subjects: Science, English, History, and Maths. The visualization uses the `d3-x3d` library to render the chart in a web browser, with data loaded from a CSV file via `d3.csv`. The chart is created using the `barChartMultiSeries` API, which draws multiple series of bars for each student, while `d3.scaleLinear` and axis functions position the bars along the axes.