An Inter-governmental Organization or IGO is "an organization whose members are the governments of different countries... Inter-governmental organizations are either global, meaning open to every country, such as the United Nations, or regional, meaning open only to states in a particular geographic region, such as the OAS in the Western Hemisphere."
(Cartwright and Conde 128)
A Non-governmental Organization or NGO is "a not-for-profit association of people working for the promotion and protection of human rights in either a general (all human rights) or a special (specific, focused on certain human rights issues) focus. NGOs may be local, national, regional, or international..."
(Cartwright and Conde 160)
Definitions from: Cartwright, Rita Cantos and H. Victor Conde. Human Rights in the United States: A Dictionary and Documents. Santa Barbara, Calif. ABC-CLIO, 2000. NetLibrary. Web. 14 Jan. 2011.