“What Is Love?” is the title track for the 5th mini album with the same name performed by K-pop girl group TWICE. “What Is Love?” was written and composed by J.Y. Park, who produced TWICE' hit “Signal” back in 2017.

Lyrically, the song is about the fantasy of love that viewers see and imagine after learning about it through books, movies or dramas. In this same respect, the music video consists of several scenes that are reconstructed from these books, movies and dramas. Sonically, TWICE sticks with the bright melody and uptempo dance beat incorporating a little trap much like their past releases.

The song debuted atop Gaon Digital Chart and Billboard Korea’s K-Pop Hot 100. It also peaked at #3 and #6 on Billboard charts' World Digital Songs and Billboard Japan Hot 100, respectively.