Societies that adopted complex ways of life were more organised than the early hunter-gatherer and Neolithic farming societies. Urban socties had social stratification and well -planned cities. They practised crafts, engaged in trade and exchange, adopted science and technology and formed political organisation (early form of state). Hence the term ‘civilisation’ is used to distinguish them from the early forms of societies. However, they should not be considered superior to other forms of societies, since each culture or civilisation had its own unique features.