What is a "nozzle" on a blow dryer used for?

A nozzle on a blow dryer is designed to direct airflow, providing more precision and control during styling. By focusing the air in a specific area, it allows for targeted drying and styling techniques, such as smoothing hair, creating waves, or adding volume to specific sections. This controlled airflow helps to minimize frizz and enhance the overall appearance of the hair.

While the other options consider important aspects of hair styling and drying, they do not accurately represent the primary function of a nozzle. For instance, creating volume can often be achieved with other techniques or attachments but is not specifically the role of the nozzle. Similarly, the cooling down of air is typically a feature of certain blow dryers but is not what the nozzle accomplishes. Adding moisture to the hair is commonly the role of conditioners or styling products rather than a function of the blow dryer itself.