Lipids are essential components of the skin’s natural barrier and are crucial for maintaining healthy and hydrated skin. They include various types of fats, such as ceramides, fatty acids, and cholesterol, that help to lock in moisture, protect against environmental stressors, and keep the skin’s surface smooth and supple. Lipids are commonly used in skincare products to replenish the skin’s lipid barrier, especially in moisturisers and creams designed for dry or sensitive skin types.