Name the three primary categories of hairstyles.

The distinction between hairstyles often revolves around their purpose and the context in which they are worn. Casual hairstyles are typically relaxed and suitable for everyday settings; formal hairstyles, on the other hand, are structured and polished, often designed for special occasions like weddings or formal events. Avant-garde hairstyles push the boundaries of traditional hair design, focusing on creativity and artistic expression, often seen in fashion shows or artistic venues.

This classification is significant because it helps hairstylists communicate with clients about their desired looks based on the occasion and personal style. Understanding these categories allows stylists to better match their techniques and products to the specific needs of each hairstyle type, ensuring satisfactory results for their clients. The other options, while they include pertinent terms, do not encapsulate the primary categories as effectively or widely recognized in the hairstyling profession.