Society refers to the structured relations and institutions among a large community of people. The concept developed in the 14th century but was further defined by Emile Durkheim in the 19th century. There are five major types of societies: hunting and gathering, horticultural/pastoral, agrarian, industrial, and post-industrial. Hunting and gathering societies were the oldest and most egalitarian but now few exist. Horticultural/pastoral societies developed agriculture and animal husbandry 10,000 years ago. Agrarian societies emerged 5,000 years ago with plow invention, creating surpluses and inequality. Industrial societies began in the 1700s and were based on factories. Post-industrial societies have