Pie Chart
A pie chart is a circular statistical graphic divided into slices to illustrate numerical proportions, where each slice's arc length (and central angle and area) is proportional to the quantity it represents. It is commonly used in data visualization to show the relative sizes of parts to a whole, making it easy to compare categories at a glance. Pie charts are widely applied in business, education, and media to present data in an intuitive, visually appealing format.
Developers should learn and use pie charts when they need to visualize categorical data where the parts sum to a meaningful whole, such as market share, budget allocation, or survey results, to quickly convey proportions to stakeholders or users. They are particularly useful in dashboards, reports, and web applications for presenting simple distributions, but should be avoided for complex data with many categories or small differences, where bar charts or other visualizations might be more effective.