Hair extensions are a type of hair accessory that is used to add length, volume, and thickness to natural hair. They are made from a variety of materials, including human hair, synthetic hair, or a combination of both.Hair extensions come in various lengths, colors, and textures, allowing users to choose the option that best matches their natural hair. They can be attached to the hair in a variety of ways, including clip-ins, tape-ins, sew-ins, and fusion extensions.