This example visualizes the relationship between years of experience and annual salary using a bar chart. Each bar represents a data point from a CSV file, with bar height encoding salary and color mapped to salary values via a quantized color scale. The chart includes labeled axes, a color legend rendered with d3-legend, and axis ticks formatted as currency. It uses d3.csv for data loading, d3.scaleBand and d3.scaleLinear for positioning, and d3.axisBottom and d3.axisLeft for ticks, all rendered as SVG within a React app.