An emulsifying agent is a substance that helps mix two liquids that usually do not blend well, such as oil and water. It works by reducing the surface tension between the liquids, allowing them to form a stable mixture called an emulsion. Common examples of emulsifying agents include lecithin, found in egg yolks, and monoglycerides, often used in food products. Emulsifying agents are widely used in various industries, including food, cosmetics, and pharmaceuticals. In food, they help create smooth textures in products like mayonnaise and salad dressings. In cosmetics, they ensure that creams and lotions maintain a consistent texture and effectiveness.