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Emollients play a crucial role in skin care products primarily by hydrating and softening the skin. These ingredients work by forming a barrier on the skin, which helps to prevent moisture loss and keeps the skin hydrated. This hydration is essential for maintaining the skin's elasticity and overall health, especially for those with dry or sensitive skin. Emollients can come from a variety of sources, including natural oils like jojoba or shea butter, as well as synthetic ingredients designed to mimic the effects of natural moisture in the skin. This function not only enhances the skin's appearance but also its texture, making it feel more supple and smooth.

In contrast, the other options represent different functions: exfoliating agents remove dead skin cells, UV protectants guard against sun damage, and fragrance components are primarily for scent enhancement rather than direct skin health benefits. Understanding the primary function of emollients is essential for choosing the right products for specific skin care needs.