The document discusses how society is organized through social groups and structures. It defines key terms like social groups, social aggregates, social categories, primary groups, secondary groups, in-groups, out-groups, and reference groups. It also explains different types of social groups based on size, including dyads, triads, and larger groups. Finally, it discusses concepts like gemeinschaft and gesellschaft, social functions, and networks in describing how order is brought to human social interactions and society.