Barrio is a Spanish word that means "quarter" or "neighborhood". In the modern Spanish language, it is generally defined as each area of a city, usually delimited by functional, social, architectural or morphological features. In Spain, several Latin American countries and the Philippines, the term may also be used to officially denote a division of a municipality. Barrio is an arabism.

A neighbourhood or neighborhood is a geographically localized community within a larger city, town, suburb or rural area, sometimes consisting of a single street and the buildings lining it. Neighbourhoods are often social communities with considerable face-to-face interaction among members. Researchers have not agreed on an exact definition, but the following may serve as a starting point: "Neighbourhood is generally defined spatially as a specific geographic area and functionally as a set of social networks. Neighbourhoods, then, are the spatial units in which face-to-face social interactions occur—the personal settings and situations where residents seek to realise common values, socialise youth, and maintain effective social control."