Hair serums are lightweight, liquid products designed to enhance the appearance and health of hair. They often contain ingredients like silicones, oils, and vitamins that help to smooth frizz, add shine, and protect against damage. Serums can be applied to damp or dry hair, making them versatile for various styling needs. These products are particularly beneficial for those with curly hair, color-treated hair, or damaged hair, as they can provide moisture and nourishment. Regular use of hair serums can lead to improved manageability and a healthier look, making them a popular choice in many hair care routines.