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Hair is a protein filament that grows from follicles found in the dermis, or skin. It is one of the defining characteristics of mammals and has played a significant role in human evolution and social interaction. The human body is covered in hair follicles, with the exception of certain areas such as the palms, soles, and lips.

Hair primarily consists of keratin, a tough protein that provides strength and durability. Its structure includes the hair shaft, which is visible above the skin, and the hair root, which extends below the skin's surface into the follicle. Hair growth occurs in cycles of growth, rest, and shedding.

Functions of hair include protection from UV radiation, regulation of body temperature, and sensory perception. In humans, hair also serves important social and aesthetic purposes, with various styles and colors often used as forms of self-expression and cultural identity.

Hair care practices vary across cultures but generally include washing, conditioning, cutting, and styling. Factors such as genetics, nutrition, and overall health influence hair growth, texture, and appearance. Hair loss, or alopecia, can result from various causes including hormonal changes, medical conditions, and aging.