Nomads are indigenous people who move strategically in a given habitat depending on the availability of food supply.
Traditionally, nomadic people has been classified into three general categories: hunters-gatherers, pastoralists and itinerants.
To this triple scheme can be added a fourth category of indigenous peoples: those ones engaged into shifting cultivation.
Until about 8,000 years ago, all humans on Earth were hunters and foragers, although nowaday these communities form a minority group among nomads. Most of them are pastoralists, born in Neolithic times at environments unfavorable to farming, who heavily depend on their herds and usually combine herding practices with trading, cultivation, hunting and gathering.
In recent times, momadism has suffered a sharp decline due to economic and political reasons, including the spread of intensive agriculture systems, the growth of industry oriented to massive production, internal re-colonization processes and state policies addressed to prioritize the interests of urban elites