For purposes of sections 205(c)(2), 405, 406, 410(d), 411, 412, and 506(e), means a registration of a claim in the original or the renewed and extended term of copyright.
Source: U.S. Copyright Office.
Federal registration of trademarks involves the establishment of rights in a mark based on legitimate use of the mark. Although federal registration of trademarks is not required to use a trademark, owning a federal trademark registration has several advantages, including notice to the public of the registrant's claim of ownership of the mark, a legal presumption of ownership nationwide, the exclusive right to use the mark on or in connection with the goods or services set forth in the registration, the ability to bring an action concerning the mark in federal court, the use of the U.S. registration as a basis to obtain registration in foreign countries, and the ability to file the U.S. registration with the U.S. Customs Service to prevent importation of infringing foreign goods.
Source: U.S. Patent and Trademark Office.