What is Love? (EP)

What Is Love? is the fifth extended play by South Korean girl group Twice. It was released on April 9, 2018, by JYP Entertainment. It includes the title track of the same name produced by Park Jin-young. Twice members Jeongyeon, Chaeyoung, and Jihyo also took part in writing lyrics for two songs on the EP.

Composed of six tracks overall, the EP received positive ratings from several music critics. It was also a commercial success for the group, reaching sales of over 340,000 copies. With this, Twice became the first Korean female act and the fifth music act overall to earn a Platinum certification from the Korea Music Content Association.