Name the three primary types of hair forms.

The classification of hair forms primarily focuses on three main categories: straight, wavy, and curly. These categories represent the fundamental textures and patterns that hair can exhibit, which are determined by genetic factors and the shape of the hair follicle.

Straight hair is typically smooth and lacks any significant curl or wave. It can appear shiny and is often easier to manage and style due to its even texture. Wavy hair features a gentle undulation, forming soft waves without the tightness associated with curls. This form often has more volume than straight hair. Curly hair is characterized by tighter curls or ringlets that can vary in size and bounce, providing a distinctive texture that often requires specific care and styling techniques.

While other options introduce terms like "kinky" and "frizzy," these descriptors can refer to variations or qualities of hair within the primary types rather than establishing separate categories of hair forms. "Kinky" typically describes a tighter curl pattern found in certain hair types, while "frizzy" refers to the texture that can result from damage or humidity, affecting the overall appearance of hair rather than its fundamental shape. Hence, the primary classification remains centered on the three core types: straight, wavy, and curly.