A scatter plot visualizes the relationship between study hours and exam scores, coloring points by high or low study time relative to the median. Interactive buttons switch the view to a donut chart of total COVID-19 cases by WHO region and a multi-line chart tracking yearly average stock prices (open, high, low, close). Built with D3 v7, it uses reusable chart functions, SVG rendering, and d3.scaleOrdinal for color mapping.