This example shows a simple bar chart displaying scores for four named items, rendered as blue rectangles on an SVG canvas. The chart uses D3 scales to map data to x and y positions, with the y-axis scaled from 0 to 100. React handles the component state and rendering, while D3's `scaleBand` and `scaleLinear` functions compute the layout geometry. The SVG is created directly with D3 selections, with the visualization set within specified margins and dimensions.