A hair extension is a strand of hair that is attached to a person's natural hair to add length, volume, or enhance the overall hairstyle. It can be made from synthetic or natural hair and offers a temporary or semi-permanent solution for transforming one's hair. Hair extensions are a popular choice for individuals looking to achieve desired hairstyles without waiting for natural hair growth. They provide versatility and flexibility in personal hair care routines, allowing for a variety of styles and looks to be easily achieved.