Final answer:
Epithelial tissue is a type of tissue that covers surfaces of the body and lines internal structures. It protects the body and performs functions such as absorption, transport, and secretion.
Step-by-step explanation:
Epithelial tissue, also referred to as epithelium, is a type of tissue that covers exterior surfaces of the body, lines internal cavities and passageways, and forms certain glands. It serves primarily as a covering or lining of body parts, protecting the body, and also functions in absorption, transport, and secretion. Epithelial tissue is made up of closely packed cells arranged in flat sheets, and it can be found in structures such as the skin and mucous membranes.