Douglas Massey in the context of "Annual Review of Sociology"

In sociology, an ethnic enclave is a geographic area with high ethnic concentration, characteristic cultural identity, and economic activity. The term is usually used to refer to either a residential area or a workspace with a high concentration of ethnic firms. Their success and growth depends on self-sufficiency, and is coupled with economic prosperity.

Douglas Massey describes how migrant networks provide new immigrants with social capital that can be transferred to other tangible forms. As immigrants tend to cluster in close geographic spaces, they develop migrant networks—systems of interpersonal relations through which participants can exchange valuable resources and knowledge. Immigrants can capitalize on social interactions by transforming information into tangible resources, and thereby lower costs of migration. Information exchanged may include knowledge of employment opportunities, affordable housing, government assistance programs and helpful NGOs. By stimulating social connections, enclaves can generate intangible resources that help to promote the social and economic development of its members.