Pre-debut: New JYP Girl Group and Sixteen
In 2012, a video of Dahyun at church performing a “head-banging, wing-flapping, and thoroughly irrepressible dance” to Hillsong’s "The Power of Your Love" went viral and earned her the moniker "Eagle Dance Church Sister." She also appeared in a video teaser for Got7's "Stop Stop It.

On December 19, 2013, JYP Entertainment 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, well-known JYP trainees Lena and Cecilia was confirmed as members of the group, while other rumored members included JYP trainees Nayeon, Jeongyeon, Jisoo (later Jihyo) and Minyoung.
After Cecilia's departure, JYP trainee Sana replaced her and 6mix was about to debut when Lena left the company, effectively canceling their debut.

On February 11, 2015, Park Jin-young announced that the lineup of JYP's upcoming seven member girl group would be decided through Sixteen, a competition survival show that would air on Mnet later that year.Park explained in a press conference prior to the show's airing that he hoped the group would "have the Wonder Girls' and miss A's natural, healthy feel, with an edgier and wilder side. I want to upgrade this next group by adding elements like hip-hop and rap."

The show began on May 5 and ended with Nayeon, Sana, Dahyun, Chaeyoung, Mina, Jihyo, and Jeongyeon as the seven Twice members. In a surprise announcement JYP announced that he would be increasing the size of the group from 7 members to 9 and adding Tzuyu (who did not make the last cut) and Momo (who was cut earlier in the program). Tzuyu was added to the group as the "audience's pick" since she was the most popular contestant by the show's end and Momo was added by JYP 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

Twice was to debut in late 2015.
On 10 July 2015, Twice opened their official Instagram account with the first picture of the nine members posing together.JYP Entertainment released TwiceTV, a web series that shared the members' hopes and stories through interviews and followed them as they prepared for their debut.

2015: Debut with The Story Begins & Page Two
On October 7, 2015, JYP Entertainment launched the band's official website and announced via SNS that the group would debut with the mini-album The Story Begins and title-track "Like OOH-AHH". The track was described as a 'color pop' dance track with elements of hip-hop, rock, and R&B.The composition team included Black Eyed Pilseung, known for composing successful releases such as Miss A's "Only You.'On October 20, the album and the song's music video were released online and through the Naver V App.The group held a live showcase the same day, where they performed "Like OOH-AHH" along with dance tracks "Must Be Crazy" and "Do It Again."The music video hit 20 million views within two months of their debut.

By December Twice had signed ten CF contracts totaling earnings of 1.8 billion Won. It is the most for any rookie girl group after a month since debut.On December 27, the band performed a remix version of their single "Like OOH-AHH" at SBS Gayo Daejeon, Twice's first-ever attendance on a year-end music program

Twice's second mini-album, Page Two, was released on April 25, 2016. The album includes title track "Cheer Up", a remake of Park Ji-yoon's "Precious Love", and "I'm Gonna Be A Star", which served as the theme song for Sixteen. The group held their comeback showcase the same day at the Yes24 Live Hall located in Seoul, South Korea.The music video of the title track hit 10 million views on YouTube within five days. Twice won their first music program award on May 5, 2016, on M! Countdown, exactly one year after the initial airing of Sixteen. This was soon followed by wins on Music Bank and Inkigayo

2016–present: Page Two, Twicecoaster: Lane 1, first solo concert and special album
On August 16, 2016, it was reported that Page Two had sold over 150,000 copies, making it the first girl group having a sales record of more than 100,000 units this year.

On September 23, 2016, Twice released their two official colours, namely Apricot (Pantone 712 C) and Neon Magenta (Pantone 812 C), which signify the group and their fan club called "Once".Five days later, JYP Entertainment announced that the group is preparing for a late October comeback with a new album and another title track by Black Eyed Pilseung, though the final schedule has not been set. On October 10, the agency released a time table for their third extended play, titled TWICEcoaster: LANE 1, through their official homepage and SNS, which shows Twice's promotion schedule beginning October 10 until the release of their album on the 24th. On October 19, Twice revealed their official light with their official colours called "Candy Bong", which is inspired by song "Candy Boy" from their first mini album.In celebration of Twice's first anniversary since debut, the group unveiled their new song "One in a Million", through a live broadcast on Naver V Live on October 20 at 22:30 KST.

On October 24, 2016, TWICEcoaster: LANE 1 and the music video of the laid-back but light and cheerful pop dance song "TT" was released online. Twice held their showcase the same day, where they performed "One in a Million", "Jelly Jelly" and "TT" for the first time.

On November 11, 2016, the music video for "Like OOH-AHH" hit 100 million views on YouTube, which makes Twice became the fourth K-pop girl group to reach 100 million views, as well as the first debut music video for any K-pop group to reach this milestone. The music video for "Cheer Up" followed six days later.

On December 5, 2016, it was announced through their official Twitter that the group would be releasing a Christmas edition of TWICEcoaster: LANE 1. It was released on December 19 with the same track listing.

On January 3, 2017, the music video for "TT" hit 100 million views, becoming the fastest K-pop group music video to do so and breaking Twice's own record previously set by "Cheer Up".

On January 10, 2017, JYP Entertainment announced Twice's first solo concert within just a year and four months of debuting in October 2015. The three-day concert titled Twice 1st Tour: Twiceland The Opening will be held on February 17–19 at the SK Olympic Handball Stadium, and is the first stop of their world tour.On January 18, the agency also announced that Twice will release a special album in February after the Korean leg of the concert tour. The album is reportedly another repackaged of Twicecoaster: Lane 1.

After the Korean leg of the concert tour, Twice released a special album on February 20 titled Twicecoaster: Lane 2, along with its lead single, "Knock Knock". It is the reissue of Twicecoaster: Lane 1.The album sold 266,645 units in February 2017.

Twice launched their Japanese website and other social media channels in early February.On February 24, they officially announced that their Japanese debut with a compilation album titled #Twice was set on June 28, 2017.

In April, JYPE announced Twice's new Korean album release in May before heading to Japan. On May 1, Twice confirmed the release of their fourth EP titled Signal with the lead track of the same name produced by Park Jin-young. This marked their first collaboration with Park. The EP, along with the music video for "Signal" was released on May 15. It contains six tracks, including "Eye Eye Eyes" co-written by members Jihyo and Chaeyoung, and "Only You" written by former Wonder Girls' member Ha:tfelt.

On June 14, Twice digitally released "Signal (Japanese ver.)", along with the short version of its music video, as a preview and countdown to album release. A week later, they released the full music video of the Japanese version of "TT".They officially debuted in Japan with the release of #Twice on June 28. It consists of ten songs including both Korean and Japanese-language versions of their first five singles. 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.#Twice debuted at number 2 on Oricon Albums Chart with 136,157 copies sold within seven days since its release.On October 18, the group released their first Japanese single, "One More Time". The music video was first released on October 6. The single album achieved the biggest first-day sales and became the fastest-selling album of any South Korean girl group in Japan. Both #Twice and "One More Time" earned Platinum certification by the Recording Industry Association of Japan (RIAJ).

Twice released their first full-length Korean album, Twicetagram, on October 30 with its lead single titled "Likey". The music video for the song was filmed in Canada in early September."Likey" was composed by Black Eyed Pilseung and Jeon Gun. It was the group's fourth collaboration with Black Eyed Pilseung. Several composers and songwriters participated in the album including the Korean members of Twice as lyricists and former Wonder Girls' member Hyerim who co-composed the eighth track titled "Look at Me". The album and its lead single debuted atop both Billboard's World Albums and World Digital Song Sales respectively—the group's first number 1, making Twice the first female K-pop act to lead on both charts. They also rose on the Heatseekers Albums as the album debuted at number 10, one position higher than Signal's peak at number 11.The Christmas-inspired reissue of Twicetagram, titled Merry & Happy along with its title track "Heart Shaker", was released on December 11, 2017.

On November 16, it was officially announced through a press conference in Tokyo that the group will debut on the 68th Kōhaku Uta Gassen, the top-rated annual year-end musical show in Japan produced by NHK. They are the first Korean artist to attend the event in the last six years and the fourth K-pop group after TVXQ, Kara and Girls' Generation.

2018–present: "Candy Pop", "What is Love?" and concert tours

Twice's second Japanese single titled "Candy Pop" was released on February 7. The group also embarked on their first concert tour in Japan titled Twice Showcase Live Tour 2018 "Candy Pop", starting on January 19 in Aichi Prefecture.On April 9, they released their fifth EP, What Is Love?, with the single of the same name produced by Park Jin-young. Twice's third Japanese single, "Wake Me Up", was released on May 16 and Twice 2nd Tour: Twiceland Zone 2 – Fantasy Park began in Seoul on May 18–20.

Twice performed a cover of The Jackson 5's "I Want You Back" as the theme song to the Japanese film adaptation of Sensei Kunshu. The song was released as a digital single on June 15, along with the music video.A second version of the music video featuring the cast of the film was released on June 26. In July, an expanded reissue of What Is Love? named Summer Nights, along with its title track "Dance the Night Away" written by Wheesung, was released

On September 12, Twice released their first Japanese studio album BDZ. Its lead single of the same name was pre-released as a digital single on August 17.It was followed with their concert tour named Twice 1st Arena Tour 2018 "BDZ", beginning in Chiba on September 29. They released their sixth EP Yes or Yes on November 5

In March and April 2019, Twice held their Japanese tour named "#Dreamday", with a total audience of 220,000 during five shows in Osaka, Tokyo and Nagoya.
On April 22, they released their seventh EP Fancy You.

sumber:https://en.wikipedia.org/wiki/Twice_(band)