What is the primary function of sebaceous glands?

Sebaceous glands are specialized structures in the skin that play a vital role in maintaining the health of the skin and hair. Their primary function is to secrete an oily substance known as sebum, which is crucial for keeping the skin soft and pliable. This natural oil forms a barrier that prevents excessive water loss, maintaining hydration and contributing to the skin's overall elasticity.

The production of sebum also has other beneficial effects, such as protecting the skin from bacterial and fungal infections, as the oily layer prevents the adherence of pathogens. Furthermore, sebum helps to waterproof the skin, shielding it against environmental factors. Thus, the primary function of sebaceous glands perfectly aligns with the role of maintaining skin softness and pliability, which is reflected in the correct answer.