In animals, particularly humans, the [epidermis](https://) is composed of multiple layers of [epithelial cells](https://). These layers include:
1. Stratum Corneum: The outermost layer, consisting of dead, keratinized cells that provide a tough, protective barrier. 2. Stratum Lucidum: Found only in thick skin, such as the palms and soles, this layer provides an extra barrier. 3. Stratum Granulosum: Characterized by granules in the cells, this layer contributes to water resistance. 4. Stratum Spinosum: Provides strength and flexibility to the skin. 5. Stratum Basale: The deepest layer, responsible for the generation of new cells through mitosis.
In plants, the epidermis is a single layer of cells covering the leaves, stems, and roots. It includes specialized structures like [stomata](https://), [trichomes](https://), and [root hairs](https://).
