A grouped bar chart, also known as a clustered bar chart, is a powerful visualization tool used to compare multiple categories across different groups. In this type of chart, bars representing subcategories are placed side by side for each main category, allowing for easy visual comparison of their values. Grouped bar charts are particularly effective for displaying relationships between a main category and its subcategories, making them ideal for analyzing data trends over time or across different conditions. They provide a clear representation of proportions and compositions, facilitating insightful data analysis and storytelling.