Amphoteric surfactants are a type of surfactant that can act as both an acid and a base, depending on the pH of the solution. They contain both positive and negative charges, allowing them to interact with various substances. This unique property makes them versatile in applications such as personal care products, detergents, and industrial cleaning agents. These surfactants are known for their mildness and low irritation potential, making them suitable for sensitive skin formulations. Common examples include cocamidopropyl betaine and lecithin. Their ability to stabilize foams and emulsions further enhances their usefulness in various formulations.