The document discusses the social life in ancient Tamilakam, which was divided into different regions called Tinais based on landscape. There were five main Tinais: Kurinchi for hilly regions where people practiced shifting cultivation; Mullai for grasslands where cattle rearing was main occupation; Palai for desert regions with no specific occupation; Marutham for wetlands where cultivation was main job; and Neytal for coastal regions where fishing and salt preparation were occupations. Each Tinai was associated with different occupations and ways of life according to their landscape.