This example displays a vertical bar chart of yearly values from a CSV file, using D3 v4 (loaded via both a CDN link and the `d3.v4.js` script). The visualization uses SVG rendering with the `d3.select` and `d3.scaleBand`/`d3.scaleLinear` APIs to map years and values to bar positions, while `d3.axisBottom` and `d3.axisLeft` generate the axes. The bars are drawn as `rect` elements, styled with a class from the provided CSS.