Physical walls, often fortified, surveilled and enforced, give the inhabitants a sense of security. Some sociologists refer to the creation of fortified enclaves as fortressing. Outsiders can often feel more excluded than with other forms of creating social distance. Opponents of gated communities argue that physical segregation is not always necessary to create defensible space, that is, to establish control over a particular space. They claim symbolic barriers can be sufficient.
One form of a gated community is a gated street, in other words a street where the entry is controlled.
In 2000, 8 million U.S residents lived in gated communities. Another attribute of gated communities is that their population is homogeneous, that is, grouped along boundaries of social class, race/ethnicity or culture. Sometimes the achievement of homogeneity, if this can be said to be an achievement, is one of the underlying purposes behind the creation of the gated community.