A scatter plot displays employee math scores against age, with each circle colored by department (Finance, HR, Engineering, Marketing, Sales, IT). The visualization uses D3 v7 with SVG rendering, loading CSV data from a GitHub repository via `d3.csv`. It employs `d3.scaleLinear` for both axes, `d3.scaleOrdinal` for color mapping, `d3.axisBottom` and `d3.axisLeft` for ticks, and a manually constructed legend with circles and text.