What Is Love? is a song by South Korean girl group TWICE, released in 2018 as the lead single from the EP of the same name. The track became one of the group's best-known hits and spread widely through K-pop fan edits, dance covers and short-form video posts. Online, this clip stays popular because its hook is instantly familiar to fans and its upbeat, romantic tone fits colorful edits, performance compilations and nostalgia-driven posts about second-generation and third-generation K-pop eras.