Final answer:
A wig is an artificial covering for the head that completely covers the client's hair. It can be made from human hair or synthetic materials, and is used for various purposes.
Step-by-step explanation:
An artificial covering for the head that completely covers the client's hair is called a wig. Wigs are commonly used for various reasons, such as to change one's appearance or to cover natural hair loss. They can be made from human hair or synthetic materials and are available in different styles, colors, and lengths.