Slum
heavily populated urban settlement characterized by squalor
A slum is a highly populated urban residential area consisting of densely packed housing units of weak build quality and often associated with poverty. The infrastructure in slums is often deteriorated or incomplete, and they are primarily inhabited by impoverished people.
Although slums are usually located in urban areas, they can be located in suburban areas where housing quality is low and living conditions are poor. Slum residences vary from shanty houses to professionally built dwellings which, because of poor-quality construction or lack of basic maintenance, have deteriorated. 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. The United Nations defines slums as ".... informal settlements lacking one or more of the following conditions: access to improved water, access to improved sanitation, sufficient living area, housing durability, and security of tenure."
Due to increasing urbanization of the general populace, slums became common in the 19th to late 20th centuries in the United States and Europe. Slums are still predominantly found in urban regions of developing countries, but are also still found in developed economies. The world's largest slum city is found in Orangi in Karachi, Pakistan.
Slums form and grow in different parts of the world for many different reasons.
This brief starts where responsible research should: with the source description of “Slum” as heavily populated urban settlement characterized by squalor. Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the general reference register because the source frames it as heavily populated urban settlement characterized by squalor. Its deeper value depends on whether names, dates, institutions and citations support that framing.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 10, 2026. The linked authority identifier is Q201759. The Library of Congress control number is sh85123553. None of the 1 selected statements returned an explicit reference.
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This entry incorporates text from “Slum” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.