It is the way of life of nomadic peoples, that is, peoples who do not have a fixed home. They don't stay in one place. Nomads are hunter-gatherers, meaning they live by hunting, fishing and gathering food. When the need arises, they move to seek better living conditions.
Nomadism was the lifestyle of the first men on Earth. This way of life was abandoned around 10,000 years ago when humans learned to plant. With agriculture, people no longer needed to look elsewhere when an area's resources ran out.