This example shows mobile phone sales data for multiple companies across twelve months as an interactive 3D bar chart. It uses the d3-x3d library to render the chart in X3DOM, a WebGL-based scene graph, by populating a `d3.x3d.chart.barChartMultiSeries()` component inside a React application. The data is loaded as CSV and parsed into a multiseries format, with D3 v5 handling scales, axes, and selections while d3-3d assists with 3D transformations.