A slum is a highly populated urban residential area consisting mostly of closely packed, decrepit housing units in a situation of deteriorated or incomplete infrastructure, inhabited primarily by impoverished persons. While slums differ in size and other characteristics, most lack reliable sanitation services, supply of clean water, reliable electricity, law enforcement and other basic services. Slum residences vary from shanty houses to professionally built dwellings which, because of poor-quality construction or provision of basic maintenance, have deteriorated.

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