ID3 is a metadata format for MP3 audio files. ID3 or ID-3 may also refer to: * ID3 algorithm, an algorithm for constructing decision trees * ID3 (gene), a human protein * ID-3 format, a standard size for identification cards defined by ISO/IEC 7810 * ID3, a post-dubstep/glitch artist * Volkswagen ID.3, a car model built by the German manufacturer Volkswagen This disambiguation page lists articles associated with the same title formed as a letter-number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article.