Urbanisation is the increase in the proportion of people living in towns and cities.
Urbanisation first occurred in MEDCs during the industrial revolution. People were attracted to urban areas (pulled) from rural areas to work in factories. They were also pushed as developments in technology led to mechanisation on farms.
Nowadays, the rate of urbanisation in LEDCs is greater than in MEDCs. As LEDCs are developing more people are migrating to urban areas.
Rates of Urbanisation – Source AQA Geography Paper 2 2014
Although urbanisation is greater in richer areas of the world compared to poor ones rates of urban growth (changes between 1950 and 2000) are higher in poorer areas of the world. As you can see from the graph above rates of urbanisation in poorer parts of the world are very high. This is due to rural-urban migration. Current rates are projected to increase due to industrialisation and economic development in some poorer countries. Urbanisation growth rates are lower in more developed countries because major urbanisation has already taken place hence the already high levels of urbanisation (over 80%).