Squamous epithelium is a type of tissue made up of flat, scale-like cells. It forms a protective layer on surfaces throughout the body, including the skin, lining of the mouth, and blood vessels. This thin structure allows for efficient exchange of substances, such as gases and nutrients, making it essential for various bodily functions. There are two main types of squamous epithelium: simple squamous epithelium, which consists of a single layer of cells, and stratified squamous epithelium, which has multiple layers. Simple squamous epithelium is found in areas where diffusion occurs, while stratified squamous epithelium provides added protection in areas subject to abrasion.