The term 501(c) refers to an American tax-exempt, nonprofit corporation or association. Section 501(c) of the United States Internal Revenue Code (26 U.S.C. § 501(c)), states 28 types of nonprofit organizations that are exempt from some federal income taxes.
Section 501(c)3 includes the following types of organizations: Religious, Educational, Charitable, Scientific, Literary, Testing for Public Safety, to Foster National or International Amateur Sports Competition, or Prevention of Cruelty to Children or Animals Organizations.