What dose nomad mean?

Nomadic people do not live in the same place year round. Instead of setting down roots, they tend to move from place to place whenever the situation warrants it. For example, many North American Indian tribes lived nomadic lifestyles, following the large game they hunted for food and clothing. If they failed to do so, the entire tribe could starve. In man's early history, everyone was nomadic, hunting and gathering to survive. Somewhere along the way, man figured out how to domesticate animals and grow crops. Only then were the first towns and cities formed, allowing some of us to abandon the nomadic lifestyle.