Shanty towns are slums on the outskirts of many cities – especially in third world countries. Normally there are not many shanty towns in more economically developed countries. Often of low cost, with houses badly built with plywood, corrugated metal, sheets of plastic, cardboard or any available material. Often irregular structures good enough to keep the rain away or to protect from the summer sun. Pets and animals are often left to roam for food and water.
Many are built on land without a permit and often have no roads, numbered street, electricity or telephone lines. Some homes in shanty towns have some services but they are unkept and pose health and fire hazards. Sometimes shanty towns can take up whole parts of a city and may include millions of dwellers – such as in the cities of Brazil- see Favelas.