Basically. It's closer in definition when an artist has been gone for a long while (Lee Hyori, BoA, etc.), but the idea is they basically "come back" when they release a new album / mini / single, since the K-Pop promo formula is a lot different than any others: rather than release singles to promote an album (in America, a hype single and then singles after the album drops, in Japan, a few singles before the album drops), they release a project with one title song to be used for promo. They may also perform another song in junction with this title track. Sometimes they may also release another title track but on the same project (which is a repackage), just to extend the promotion period, but this isn't always the case.