Shape model is a research area that focuses on the representation and analysis of the shape of objects or structures in various fields such as mathematics, computer vision, and biology. It involves developing mathematical models and algorithms to describe, analyze, and compare the shape of objects, allowing for tasks such as object recognition, classification, and segmentation. Shape models can be 2D or 3D and can range from simple geometric primitives to more complex representations that capture the intricate details of object shapes. Researchers in this area often use techniques such as shape descriptors, point clouds, and contour analysis to quantify and analyze shape information.