This scatter plot visualizes heart stroke prediction data, showing the relationship between average glucose level (x-axis) and age (y-axis). Each circle represents a data point, with color encoding smoking status: blue for formerly smoked, yellow for never smoked, green for smokers, and red for unknown. The visualization uses D3 v6 APIs including `scaleLinear`, `axisLeft`, and `axisBottom` to construct the axes. The data is loaded from a GitHub gist CSV file using `d3.csv`, and the SVG is rendered to fill the full browser window with a custom legend implied by the color mapping.