Hair applications refer to products used to style and maintain hair, such as GELS. GELS are a type of hair product that is applied to wet or dry hair to give it a desired shape or texture. They are usually made from water, alcohol, and polymers, and can be used to create a variety of looks, from sleek and shiny to spiky and textured. GELS are often used to hold a hairstyle in place for a longer period of time.