Donut Chart
A donut chart is a circular statistical graphic that displays data as proportions of a whole, similar to a pie chart but with a hollow center. It is used to visualize categorical data where each slice represents a percentage or fraction of the total, making it effective for showing part-to-whole relationships. The central hole can optionally display additional information like totals or labels, enhancing readability and design flexibility.
Developers should learn donut charts when building data visualization applications, dashboards, or reports that require clear representation of proportions, such as in business analytics, survey results, or budget allocations. They are particularly useful in web and mobile apps where space is limited, as the hollow center can reduce visual clutter compared to pie charts. Use cases include displaying market share, user demographics, or progress tracking in tools like React or D3.js-based projects.