Shampoo, soap and conditioner are all things that can help keep your hair and scalp clean and healthy. Shampoo is a liquid that you use to wash your hair. It helps remove dirt and oil from your hair and scalp. Soap is a solid cleaning product that you use to wash your body. Soap won't mess with your hair too much, but it won't help to clean your hair. Conditioner is a lotion or cream that you put in your hair after washing it with shampoo. Conditioner helps keep your hair soft and shiny, and can help make it easier to brush and style.