Anionic surfactants are a type of surfactant that carries a negative charge. They are commonly used in cleaning products, such as detergents and shampoos, due to their ability to effectively remove dirt and grease. The negative charge helps them to interact with positively charged dirt particles, allowing for better cleaning performance. These surfactants work by reducing the surface tension of water, making it easier for the liquid to spread and penetrate surfaces. Common examples of anionic surfactants include sodium lauryl sulfate and linear alkylbenzene sulfonate. Their effectiveness and foaming properties make them popular in both household and industrial applications.