What primary function do sebaceous glands serve in the skin?

Sebaceous glands primarily serve the function of producing sebum, an oily substance that helps to moisturize and protect the skin and hair. Sebum is secreted into hair follicles, where it coats the hair and the skin surface, providing a natural barrier against dehydration and helping to maintain skin elasticity. Additionally, sebum has antibacterial properties that can assist in protecting the skin from infections, but its main role is to ensure that the skin retains moisture and remains healthy. This moisturizing function is essential for skin integrity and preventing dryness, thereby contributing significantly to overall skin health.