What is the primary role of a blow dryer in styling hair?

The primary role of a blow dryer in styling hair is to eliminate moisture and shape the hair. This process involves using heated air to evaporate the water content in damp hair, which helps in setting the desired style. By directing the airflow and adjusting the heat, a stylist can manipulate the hair's texture and volume, allowing for various styling techniques such as smoothing, curling, or creating body. This shaping process is essential in achieving a polished and finished look.

Adding shine to hair, chemically altering its structure, or enhancing hair color are secondary outcomes or functions that may occur during the hair styling process, but they are not the primary purpose of using a blow dryer. The blow dryer primarily facilitates drying the hair while providing the stylist with control over how the hair is shaped during the styling phase.