This bar chart visualizes the relationship between years of experience and annual salary, with each bar's height representing salary and its color intensity mapped from a green color scale. The visualization uses D3 v7 to render SVG elements, employing `d3.scaleBand` for the x-axis, `d3.scaleLinear` for the y-axis, and `d3.scaleQuantize` with ColorBrewer's Greens palette for encoding salary values. Data is loaded asynchronously from a CSV file via `d3.csv`, and a color legend is generated using the d3-legend library.