This example displays a bar chart of sales amounts by country, with the USA, UK, and Canada as categories. Each bar’s height encodes the corresponding sales value. The visualization uses D3 v7 to create an SVG chart, employing `d3.scaleBand` for the x-axis and `d3.scaleLinear` for the y-axis, along with `d3.axisBottom` and `d3.axisLeft` for grid lines. Data is hardcoded in the script, and the rendering is purely SVG-based within a React-free HTML page.