Final answer:
Hair secured to a client's natural hair to add length, volume, texture, or color is a hair extension.
Step-by-step explanation:
Hair secured to a client's natural hair to add length, volume, texture, or color is a hair extension. Hair extensions are artificial hairpieces that are attached to a person's natural hair, typically using methods such as gluing, sewing, or clipping. They are commonly used in the beauty industry to achieve various hair styling goals.
For example, if a person wants to add length to their hair, they can have hair extensions applied to increase the overall length. Similarly, if someone wants to add volume or thickness to their hair, extensions can be used for that purpose as well. Hair extensions can also be used to add texture or color to enhance the appearance of the natural hair.