Cosmetic emulsions are mixtures of two immiscible liquids, typically oil and water, stabilized by emulsifiers. These formulations are commonly found in products like creams, lotions, and serums, allowing for a smooth texture and easy application on the skin. The emulsifiers help to blend the ingredients, ensuring that the product remains uniform and effective. Emulsions can be classified into two main types: oil-in-water (O/W) and water-in-oil (W/O). O/W emulsions have a lighter feel and are often used in moisturizers, while W/O emulsions provide a richer texture, making them suitable for creams and balms. Both types offer unique benefits for skin hydration and protection.