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Twice (Korean: 트와이스; RR: Teuwaiseu; Japanese: トゥワイス, Hepburn: Tuwaisu; commonly stylized as TWICE) is a South Korean girl group formed by JYP Entertainment. The group is composed of nine members: Nayeon, Jeongyeon, Momo, Sana, Jihyo, Mina, Dahyun, Chaeyoung, and Tzuyu. Twice was formed under the television program Sixteen (2015) and debuted on October 20, 2015, with the extended play (EP) The Story Begins.

Twice rose to domestic fame in 2016 with their single "Cheer Up", which charted at number one on the Gaon Digital Chart, became the best-performing single of the year, and won "Song of the Year" at the Melon Music Awards and Mnet Asian Music Awards. Their next single, "TT", from their third EP Twicecoaster: Lane 1, topped the Gaon charts for four consecutive weeks. The EP was the highest selling Korean girl group album of 2016. Within 19 months after debut, Twice had already sold over 1.2 million units of their four EPs and special album. As of December 2020, the group has sold over 15 million albums cumulatively in South Korea and Japan.

The group debuted in Japan on June 28, 2017, under Warner Music Japan, with the release of a compilation album titled #Twice.The album charted at number 2 on the Oricon Albums Chart with the highest first-week album sales by a K-pop artist in Japan in two years. It was followed by the release of Twice's first original Japanese maxi single titled "One More Time" in October. Twice became the first Korean girl group to earn a platinum certification from the Recording Industry Association of Japan (RIAJ) for both an album and CD single in the same year. Twice ranked third in the Top Artist category of Billboard Japan's 2017 Year-end Rankings, and in 2019, they became the first Korean girl group to embark on a Japanese dome tour.

Twice is the first female Korean act to simultaneously top both Billboard's World Albums and World Digital Song Sales charts with the release of their first studio album Twicetagram and its lead single "Likey" in 2017. With the release of their single "Feel Special" in 2019, Twice became the third female Korean act to chart into the Canadian Hot 100. After signing with Republic Records for American promotions as part of a partnership with JYP Entertainment, the group has charted into the US Billboard 200 with More & More and Eyes Wide Open in 2020, Taste of Love and Formula of Love: O+T=<3 in 2021, and Between 1&2 in 2022. Their first official English-language single, "The Feels", became their first song to enter the US Billboard Hot 100 and the UK Singles Chart, peaking at the 83rd and 80th positions of the charts, respectively. They have been dubbed the next "Nation's Girl Group", and their point choreography—including for "Cheer Up" (2016), "TT" (2016), "Signal" (2017), and "What Is Love?" (2018)—became dance crazes.

" i smile again cause youre there."

On December 19, 2013, JYP Entertainment (JYPE) announced that they would debut a new girl group in the first half of 2014, the first female group to come out of the company since the debut of Miss A in 2010. On February 27, 2014, JYPE trainees Lena and Cecilia were confirmed as members of the group tentatively called as 6MIX, while other rumored members included JYPE trainees Nayeon, Jeongyeon, Jihyo and Minyoung. The group's debut plan was eventually canceled when Lena and Cecilia left the company.

On February 11, 2015, J. Y. Park, the founder of JYPE, announced that the lineup of the upcoming seven-member girl group would be decided through Sixteen, a competition survival show that would air on Mnet later that year.The show began on May 5 and ended on July 7 with Nayeon, Jeongyeon, Sana, Jihyo, Mina, Dahyun, and Chaeyoung being selected as the seven Twice members. Park then announced that he would increase the size of the group from seven members to nine by adding Tzuyu, who was known as the "audience's pick" since she was the most popular contestant by the show's end, and Momo, who was added by Park himself since he felt the group needed someone with Momo's performance abilities. The decision was controversial at the time, with many people complaining about eliminated contestants being able to join the group. The group's name, Twice, was chosen by Park, explaining that "the group will touch people's hearts twice: once through the ears, and once again through the eyes." Fans of Twice are known as "Once", commonly stylized in all caps, illustrated by the members' statement "If you love us even once, we will repay your love with twice of our love" on social media in 2015.

Twice made their official debut on October 20, 2015, with the release of their debut EP The Story Begins, simultaneously with its lead single "Like Ooh-Ahh" alongside a live showcase to promote it.The group initially received a lukewarm reception; while their EP debuted at number 4 on the Gaon Album Chart for the week ending October 24 before peaking at number 3 two weeks later,its lead single "Like Ooh-Ahh" met moderate success debuting at number 22 on the Gaon Digital Chart. A week after its release, the single dropped to number 57 on South Korea's largest music site Melon, but through word of mouth from netizens regarding the group's subsequent promotions and performances, "Like Ooh-Ahh" reached within the top 10 of various Korean music charts including Melon, Genie, and Naver Music by November 15. Such a reverse run on music charts by a rookie girl group was deemed unusual by Korean media. Eventually, "Like Ooh-Ahh" reached peak position of number 10 on the Gaon Digital Chart, three months after the song's original release.The music video for the group's single hit 50 million views on YouTube within five months of their debut and became one of the most-viewed debut music videos for any K-pop group.The group's early success earned them a "Best New Female Artist" award at the 2015 Mnet Asian Music Awards held on December 2.On December 27, Twice performed a remix version of their single "Like Ooh-Ahh" at SBS Gayo Daejeon, which was the group's first-ever attendance on a year-end music program.