The term "subcutaneous" refers to the layer of tissue located just beneath the skin. This layer is primarily composed of fat and connective tissue, which helps insulate the body and protect underlying muscles and organs. Subcutaneous tissue also serves as a reservoir for energy storage and plays a role in regulating body temperature. In medical contexts, "subcutaneous" is often used to describe injections or medications administered into this layer of tissue. For example, insulin is commonly delivered via subcutaneous injections to help manage diabetes. This method allows for slower absorption into the bloodstream compared to intramuscular or intravenous routes.