Squatter settlements are the result of rapid urbanisation processes in developing countries and are formed to meet housing requirements for urban poor which migrate to big cities and have no chance to find adequate housing supply. Squatter Settlements are defined as mainly uncontrolled, low-income and/or poor residential areas with an ambiguous legal status regarding land occupation, built to a large extent with people's own means, and usually not or poorly equipped with public utilities and community services. In most countries they are officially illegal, due to their non-conformity to national and urban planning, and building and servicing standards.