In sociology, industrial society refers to a society driven by the use of technology to enable mass production, supporting a large population with a high capacity for division of labour. Such a structure developed in the west in the period of time following the Industrial Revolution, and replaced the agrarian societies of the Pre-modern, Pre-industrial age. Industrial societies are generally mass societies, and may be succeeded by an Information society. They are often contrasted to with the traditional societies. Industrial society is characterized by the use of external energy sources, such as fossil fuels, to increase the rate and scale of production. The production of food is shifted to large commercial farms where the products of industry, such as combine harvesters and fossil fuel based fertilizers, are used to decrease required human labor while increasing production. No longer needed for the production of food, excess labor is moved into these factories where mechanization is utilized to further increase efficiency. As populations grow, and mechanization is further refined, often to the level of automation, many workers shift to expanding service