Final answer:
Sebaceous glands produce sebum, an oily substance that protects and waterproofs skin and hair, and possesses antibacterial properties to prevent microbial growth on the skin.
Step-by-step explanation:
The sebaceous glands produce a lipid-rich substance known as sebum. This oily substance is crucial for maintaining the health and protection of the skin. Sebum is secreted into hair follicles and ultimately makes its way to the surface of the skin. Its main functions are to waterproof the hair and skin, prevent them from drying out, and provide antibacterial properties to inhibit the growth of microorganisms on the skin. Notably, these glands are present all over the body except for the palms of the hands and the soles of the feet, as these areas do not grow hair.
Other glands like the sudoriferous glands (eccrine and apocrine sweat glands) harbor different responsibilities such as regulating body temperature and playing a role in communication through scent. However, when it comes to protecting the skin with a lipid-rich substance, sebaceous glands are the one responsible.