What tissue type primarily makes up the epidermis?

The epidermis is primarily composed of squamous epithelium, specifically keratinized stratified squamous epithelium. This tissue type is essential for forming a protective barrier against environmental hazards such as pathogens, chemicals, and physical abrasions. The flattening of the cells in the upper layers of the epidermis is a key feature of squamous epithelium, allowing for efficient coverage and protection of underlying tissues.

In the context of the options provided, squamous epithelium plays a crucial role in maintaining the integrity and functionality of the skin, serving not only as a barrier but also in processes such as sensation and thermoregulation. It is the most superficial layer of the skin, making it vital for overall skin health.