The group is composed of nine members: Nayeon, Jeongyeon, Momo, Sana, Jihyo, Mina, Dahyun, Chaeyoung, and Tzuyu, and was formed by JYP Entertainment in July 2015 through the survival television show Sixteen.

The group released their fifth EP, What Is Love?, in April 2018, which was reissued as Summer Nights in July of the same year.

[4] Selling over 250,000 copies, What Is Love?, Summer Nights, Yes or Yes, and The Year of "Yes" each earned a platinum certification from the Korea Music Content Association (KMCA).

The group's seventh and eighth EPs, Fancy You and Feel Special, were released in April and September 2019 respectively, and both later received a double platinum certification from the KMCA.

In 2020, the group released their ninth EP, More & More, and second Korean studio album, Eyes Wide Open, of which both charted on United States' Billboard 200.

They released their third Korean studio album, Formula of Love: O+T=<3 in November, which earned them their first triple platinum certification from the KMCA.

Twice's Japanese debut occurred in 2017 with their first compilation album, #Twice, which earned the group their first platinum certification from the Recording Industry Association of Japan (RIAJ).