Twice was formed under the television program Sixteen (2015) and debuted on October 20, 2015, with the extended play (EP) The Story Begins, and has received the honorific title of "The Nation's Girl Group" in their home country.

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.

After signing with Republic Records for American promotions as part of a partnership with JYP Entertainment, the group achieved five top-ten albums on the US Billboard 200 and topped the chart in 2024 with their thirteenth extended play With You-th.

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.

[17][18] Eventually, "Like Ooh-Ahh" reached a peak position of number 10 on the Gaon Digital Chart, three months after the song's original release.

[22] 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.

[25] On April 25, 2016, Twice released their second EP, Page Two, which notably included the lead single "Cheer Up", a rearranged version of Park Ji-yoon's 1998 hit "Precious Love", and "I'm Gonna Be a Star", which served as the theme song for Sixteen.

[35] "Cheer Up" also received international success, debuting and peaking at number three on the Billboard World Digital Song Sales chart.

[38][39] The group then made their debut performance in the United States with an appearance at the KCON music festival held in Los Angeles on July 31.

[44][45] In Korea, the album recorded more than 165,000 physical copies sold on the Gaon Chart within a week, exceeding the five-month sales of the group's previous release Page Two in only seven days.

The three-day sold-out concert titled "Twice 1st Tour: Twiceland – The Opening" was held on February 17–19 at the SK Olympic Handball Gymnasium.

[68] With the commercial success of Signal, it was reported that Twice had reached cumulative sales of over 1 million copies of their five albums, achieving the feat in just one year and seven months after debuting.

[71] On July 2, Twice held their two-part debut showcase titled "Touchdown in Japan" at Tokyo Metropolitan Gymnasium, attended by a total of 15,000 people.

[122] The group also released a repackage of BDZ with "Stay by My Side", the theme song of the Japanese television drama Shinya no Dame Koi Zukan, on December 26.

[128] The music video for "Fancy", which garnered over 42.1 million views in a single day, also reached the seventh position in the list of YouTube's biggest debuts during the first 24 hours.

[130] Following the release of the album, the group embarked on their first world tour titled "Twicelights" which was first held at a sold-out KSPO Dome in Seoul on May 25–26.

[137] Twice released their eighth EP, Feel Special, on September 23, along with the music video for the lead single of the same name produced by Park Jin-young.

[158] On February 24, it was announced that the group had signed with Republic Records for promotion in the United States as part of JYP Entertainment's partnership with the label.

[159][160] The documentary series Twice: Seize the Light first premiered on April 29 through YouTube Originals, which features nine episodes that follow the group's members throughout their journey as trainees to their first world tour "Twicelights".

[168] The group released their second Korean studio album, Eyes Wide Open, on October 26 with the lead single titled "I Can't Stop Me".

[171] Twice then collaborated with the virtual girl group K/DA, with members Nayeon, Sana, Jihyo, and Chaeyoung being featured on the song "I'll Show You" as part of K/DA's first EP All Out released on November 6.

[175] The group then made their US television debut with their appearance on the "#PlayAtHome" series of The Late Show with Stephen Colbert on November 30, performing their song "I Can't Stop Me".

[200] In addition, the group is scheduled to hold their Tokyo Dome concert in Japan for two days on April 23 and 24, but as the tickets were sold out at the same time as the opening sale, they added a performance on the 25th.

[229] The group had come to develop a signature "color pop" sonic style described as a combination of rock, R&B, and hip hop coupled with notable hooks in their music.

[230][231] They have since experimented with EDM, synth-pop, and retro soul among others in their eighth EP Feel Special;[232] tropical house, Latin pop, and new jack swing in their ninth EP More & More; retro-synth, dance-pop, Japanese city-pop, and contemporary R&B in their second Korean studio album Eyes Wide Open;[233][234] and disco-pop, reggae-pop, and trap in their third Korean studio album Formula of Love: O+T=<3.

For instance, their 2016 single "TT" is named after the crying emoticon which was imitated in the group's point choreography, while their 2017 track "Likey" lyrically alludes to Instagram culture and the struggles of maintaining a beautiful social media image.

[252] Twice's distinctive point choreography—including for "Cheer Up" (2016), "TT" (2016) and "Signal" (2017)— became dance crazes and viral memes imitated by many celebrities in South Korea.

[256] In Japan, the group's positive reputation and relatability amongst fans were attributed by local media to the presence of Japanese members Momo, Sana, and Mina who gained Twice fame in the country even before their debut.

[286][287] In 2021, Twice's tenth extended play, Taste of Love, peaked at number-one on the Billboard Top Album Sales chart, making it the first EP from a girl group to do so.

[293][294] In early 2017, Twice was selected by beverage maker Donga Otsuka to promote the company's flagship sports drink Pocari Sweat on its 30th anniversary.