A diffuser is a hair styling tool that evenly distributes heat from a blow dryer, reducing damage and enhancing natural curls or waves. By dispersing airflow, it protects hair from concentrated heat, preventing breakage and preserving moisture.
Diffusers are particularly beneficial for curly or wavy hair, as they help define and enhance curls while reducing frizz. Historically, diffusers evolved from the traditional "sock method," where women would blow dry their hair through the toe of a sock to achieve similar results.