Protoderm is a type of tissue found in plants that gives rise to the outer layer of cells, known as the epidermis. It is one of the three primary meristematic tissues, which are responsible for plant growth. The protoderm develops from the apical meristem and plays a crucial role in protecting the plant and regulating gas exchange. The cells of the protoderm eventually differentiate into various types of epidermal cells, including guard cells and trichomes. These cells help to form a protective barrier against environmental factors, such as pathogens and water loss, ensuring the plant's overall health and survival.