For humans, haircut, hairstyle, or hairdo normally describe cutting or styling head hair. Unlike other animals, human beings of many cultures cut their hair, rather than letting it grow naturally. Hair styles are often used to signal cultural, social, and ethnic identity and can be used to illustrate social status or individuality. Men and women naturally have the same hair, with the primary component of hair fiber being keratin. Keratins are proteins, long chains of amino acids. Generally, hairstyles conform to cultural influences of gender. Fashion trends may have a great influence depending on the person.
There is a thriving world market in cut human hair of sufficient length for wig manufacture and for the production of training materials for student hairdressers and barbers. In less developed countries, selling one's hair can be a significant source of income — depending on length, thickness, condition, and color, wig makers have been known to pay as much as US$40 for a head of hair.[citation needed] In the United States, cut hair of at least 10 inches (25 cm) length may be donated to a charity, such as Locks of Love.
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