A concentration of dwellings built on land neither owned nor rented by the builders is termed?

A concentration of dwellings built on land that is neither owned nor rented by the builders is called a "squatter settlement". In these settlements, people build homes on land that is not legally theirs, often without proper permits or government approval. Squatter settlements are common in urban areas, particularly in developing countries where there is a shortage of affordable housing. These settlements often lack basic services such as running water, sanitation, and electricity, and are built using whatever materials are available. Squatter settlements are a result of a combination of factors, including poverty, a lack of affordable housing, and limited access to land. They can be found on the outskirts of cities or even within the city itself. Despite their often precarious conditions, many people in squatter settlements have created vibrant communities and livelihoods for themselves.