The term "hair products" refers to a wide range of items that are designed to help maintain, style and improve the appearance of hair. These can include shampoos, conditioners, hairsprays, gels, mousse, serums, oils, and other treatments that are applied directly to the hair or scalp. The specific purpose of each product may vary, but generally they aim to cleanse, moisturize, volumize, strengthen, repair, or otherwise enhance the overall health and appearance of hair.