A nonionic surfactant is a type of surface-active agent that does not carry any electrical charge. These surfactants are commonly used in various applications, including cleaning products, detergents, and personal care items. Their ability to reduce surface tension helps to improve the wetting and spreading of liquids, making them effective in removing dirt and grease. Nonionic surfactants are often preferred for their mildness and compatibility with other ingredients. They can be found in products like shampoos, laundry detergents, and industrial cleaners. Due to their nonionic nature, they are less sensitive to changes in pH and water hardness, making them versatile in different formulations.