| Term | Definition |
| Muhammad | Arab prophet, and founder of Islam |
| Qur'an | The sacred text of Islam, believed it is the world of the God |
| Islam | The religious faith of Muslims, absolute submission to Allah |
| Mecca | The spiritual center of Islam, and the birthplace of Muhammad |
| Medina | A city in W Saudi Arabia, where Muhammad was first accepted as the supreme Prophet from Allah |
| Five Pillars | 5 basic commandment include: Faith, Prayer, Alms, Fasting, and Pilgrimage |
| Hadith | Muhammad's way of live, and the examples of him. Also called Sunna |
| Caliph | A spiritual leader of Islam, claiming succession from Muhammad |