Which aspect is included in the field of cosmetology?

The field of cosmetology encompasses a wide range of beauty services including hairdressing, skin care, and nail care. Among these, facials and hair coloring are important components. Facials involve the cleansing, exfoliation, and hydration of the skin, while hair coloring is a vital service offered by cosmetologists to enhance or change the color of a client's hair. This broad scope means that those trained in cosmetology are equipped to provide a variety of beauty treatments, thereby helping clients with their overall appearance.

In contrast, options suggesting that cosmetology includes only hairdressing, only manicures, or hair extensions alone fail to recognize the comprehensive nature of the field. Each of these options represents a limited area of practice, while the chosen answer acknowledges the diverse skills and services provided within cosmetology. This understanding is essential for anyone preparing for a career in the beauty industry, as it highlights the versatility and breadth of services that professionals are trained to offer.