What is the primary function of epithelial tissue?

The primary function of epithelial tissue is to cover and protect surfaces and organs. This type of tissue forms the outer layer of the skin, lines cavities and organs, and is involved in the absorption, secretion, and sensation processes. Epithelial tissue serves as a barrier protecting underlying structures from injury, pathogens, and fluid loss, while also playing crucial roles in the exchange of materials, such as in the lining of the intestines where absorption occurs. This fundamental role in protection and covering makes it distinct from other tissue types, which have different primary functions such as providing structural support or facilitating communication.