A pie chart is a type of statistical chart used to show the proportion of each part to the whole. The size of each slice is proportional to its corresponding value, making it ideal for displaying the composition and ratio relationships of data. This tool supports custom data entries, color settings, legend display, and more. The generated chart can be exported as PNG or SVG format. Suitable scenarios include market share analysis, budget allocation, voting results, time distribution, and other data visualizations that require showing proportional relationships.