Shape representation is a fundamental concept and research area concerned with the methods and techniques used to describe, encode, and store geometric forms or shapes. It investigates how to abstract the spatial characteristics of objects, surfaces, or volumes into computational or mathematical structures suitable for analysis, manipulation, comparison, and storage. Key characteristics include capturing topological and geometric properties, handling variations in scale and orientation, and balancing descriptive power with computational efficiency, making it essential for tasks in computer vision, computer graphics, pattern recognition, and related fields.