Sikhism originated in the 15th century in the Punjab region of South Asia and is now practiced by over 20 million people worldwide. It was founded by Guru Nanak and has 10 spiritual leaders known as Gurus. Sikhism teaches a belief in one God and rejects practices like idol worship and the caste system. Sikhs are known by their visible articles of faith which include uncut hair worn under a turban, a wooden comb, steel bracelet, and a small ceremonial knife. They regularly visit the Golden Temple, the holiest site in Amritsar, India, for prayer and community meals.