This interactive dashboard combines a bar chart and a pie chart to explore categorical data across different regions. Hovering over a bar filters the pie chart and legend to show the breakdown of sub-categories for that region. The visualization uses D3.js (v3) to render SVG elements with animated transitions, and is built within a React framework. The bar chart displays frequencies for each region, while the pie chart and legend update dynamically to reflect the selected region's distribution, using mouseover and mouseout events to trigger the updates.