.org
Top-level domain
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The domain name .org is a generic top-level domain of the Domain Name System used on the Internet. The name is truncated from 'organization'. It was one of the original domains established in 1985, and has been operated by the Public Interest... Wikipedia
Actual use: Nonprofits; personal sites; open-source projects; some government websites; mostly used by non-commercial entities
Documents: RFC 920; RFC 1591; ICANN registry agreement
Intended use: Miscellaneous organizations not fitting in other categories (generally noncommercial)
Registry: Public Interest Registry (technical service by Afilias)