Which tool is primarily used for blow-drying hair?

The blow dryer is specifically designed for the purpose of drying hair by blowing hot or cool air onto it. This tool allows hairdressers to effectively remove moisture from hair after washing, enabling quick styling and finishing touches. The main function of a blow dryer is to expedite the drying process while allowing for some degree of styling manipulation, such as adding volume or enhancing curl formation, depending on the technique used.

In contrast, a flat iron and hair straightener are primarily utilized to straighten the hair by applying heat to the hair strands, while a curling iron is designed to create curls or waves. None of these tools focus on drying hair as their primary function, making the blow dryer the essential tool for this task.