Rainbow was a South Korean girl group formed in 2009 by DSP Media. The group consisted of seven members: Woori, Seungah, Jaekyung, Noeul, Yoonhye, Jisook and Hyunyoung. They released their debut mini album Gossip Girl on November 12, 2009. On October 27, 2016 the group was officially confirmed to disband after all members decided to not renew their contracts.

2009–10: Formation and Gossip Girl

During late October and early November 2009, DSP Media released daily teasers in the form of pictures of Rainbow, and then a music video for "Gossip Girl" on November 6, 2009. On November 12, the five-song EP Gossip Girl was released. On August 12, 2010, Rainbow released the single "A". A second single, "Mach", was released on October 20. In April 2011, Rainbow released their second EP, So Girls. One song from the EP, "To Me", was released as a single. On September 7, 2011, Rainbow topped Recochoku's weekly download rankings for the Japanese release of their "A" music video. On September 14, 2011, Rainbow released their debut single in the Japanese market, "A", and reached No. 3 on Oricon's daily single chart, selling 10,141 copies. The single release included a Japanese remake of their debut single "Gossip Girl", as well as an exclusive DVD. Rainbow made their Japanese TV debut on the show Sukkiri, performing "A". On December 7, 2011, the group released their second Japanese single, a Japanese version of the song "Mach" (Japanese: マッハ), and reached No. 9 on Oricon's weekly chart.

2012–13: Rainbow Pixie, Over the Rainbow and Rainbow Syndrome

On January 3, 2012, DSP Media announced that a section of the group will be formed as a trio. On the same day, a teaser image was revealed on DSP Media's website, revealing "Rainbow Pixie" as the trio's name. On January 4, 2012, another image revealed the members of the group as SeungAh, Jisook and Hyunyoung. The group released their debut song, "Hoi Hoi", on January 12, 2012, and held their first performance on Show! Music Core. Rainbow released a Japanese single on March 14, 2012, entitled "Gonna Gonna Go!" (Japanese: ガナガナGO!). Their Japanese debut album, Over the Rainbow, was released on March 28. The group released the first part of their first studio album, Rainbow Syndrome, on February 13, 2013.

2014–16: Rainbow Blaxx, Innocent, Prism and disbandment

A second subunit, named Rainbow Blaxx, was formed in January 2014 consisting of Jaekyung, Woori, Seungah and Hyunyoung. Their special album, RB Blaxx, was released on January 20, 2014. The music video for the title track, "Cha Cha", was directed by Digipedi and was the fourth-most viewed K-pop music video globally in January 2014. The music video, as well as the song's choreography, drew controversy for being "too sexual". Rainbow's third mini album, Innocent and the music video for its title track, "Black Swan" were released on February 23, 2015.[ Their fourth mini-album Prism and the music video for its title track "Whoo" was released on February 15, 2016. They also held their commemorative showcase at the Yes24 Muv Hall in Seoul's Mapo-gu, which was broadcast through the Naver V App on the same day as the album release. Rainbow held their first comeback stage with "Whoo" through SBS MTV's The Show on February 16.

In the summer 2016, Rainbow collabored with Makestar and various photographer to release their first photobook titled "Up Close" and sponsored by the groups fans around the world, funding started on August 2. On October 27, 2016, it was confirmed that the members of the group choose not to resign with DSP Media and that Rainbow would be disbanded as their contracts were set to end, on November 12. Prior to disbandment, the members went on a farewell trip to Southeast Asia.- Wikipedia