Hair texture is the measure of the circumference of the hair strand itself. Professionals classify the texture of hair as being "coarse", "fine", or "medium".
Coarse hair is stronger, for obvious reasons - it has more substance. However, coarse hair can also be harder to process, and can be resistant to haircoloring services, perming, and straightening. Fine hair, conversely, is often very easy to process, and can be over-processed easily and is susceptible to damage from chemical services.
Hair texture varies from individual to individual, and can be different in separate areas of the same head. You may have coarse hair on the top of the head and fine hair at the nape of the neck. Race and ethnicity are irrelevant in determining hair texture, as coarse, medium and fine hair can be found among all racial and ethnic groups.
Hair wave pattern