Hair strands, the individual filaments that compose hair, are the defining characteristic of this protective and expressive covering found on the head and various body parts. Hair strands exemplify the biological diversity of humans, with distinct textures, colors, and growth patterns.
Their structural composition, primarily keratin, provides strength and flexibility. Hair strands serve as insulators, protecting the scalp from heat loss and shielding it from UV radiation. Historically, hair has held cultural and social significance, with hairstyles and treatments reflecting societal norms and personal identity.