Bow hair refers to the fine, soft hair obtained from the tails of certain animals, primarily horses. This hair is often used in the crafting of stringed instruments, such as violins and cellos, where it is attached to the bow to create sound when drawn across the instrument's strings. The unique properties of bow hair, including its strength and ability to hold rosin, make it ideal for this purpose. Rosin is a sticky substance applied to the hair to increase friction, allowing musicians to produce a clear and resonant tone. Bow hair is typically replaced periodically to maintain optimal performance.