Shampoo is a hair care product used to remove oils, dirt, and other contaminants from hair without stripping it of natural oils. Its origins can be traced back to practices in India involving head massages and herbal treatments. Modern shampoo formulations typically contain surfactants like sodium lauryl sulfate that create lather, along with other ingredients to condition hair and adjust viscosity, fragrance, and pH level. Specialized shampoos have also been developed for issues like dandruff or colored hair.