Henna has been used for thousands of years in Africa, India, and the Middle East. It is traditionally applied for weddings, celebrations, and rites of passage using a paste made from crushed henna leaves. The paste is applied to the skin and leaves intricate designs that fade gradually over 1-3 weeks. Henna application styles vary between regions and cultures, with Indians using fine floral patterns, Arabs using large floral hand/foot designs, and Africans preferring bold geometric designs sometimes made black using unsafe methods. Today, henna is widely available commercially but also continues to be an important cultural tradition.