Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Nomadic people (Greek: νομάδες, nomádes, "those who let pasture herds") are communities of people who move from one place to another, rather than settling permanently in one location. There are an estimated 30-40 million nomads in the world. Many cultures have traditionally been nomadic, but traditional nomadic behavior is increasingly rare in industrialized countries. Nomadic cultures are discussed in three categories according to economic specialization: hunter-gatherers, pastoral nomads, and "peripatetic nomads".