Creases are lines or folds that form on a surface, often seen in fabrics, paper, or skin. They occur when a material is bent or pressed, creating a noticeable indentation. In clothing, creases can be intentional, such as in dress pants, where they add a polished look. In the context of paper, creases can result from folding, which is common in origami or when making cards. On skin, creases may develop with age or due to repeated facial expressions, often referred to as wrinkles. Understanding creases helps in various fields, including fashion and design.