2NE1 (Korean: 투애니원, IPA: [tʰu.ɛ.ni.wʌn]) was a South Korean girl group formed by YG Entertainment that was active between 2009 and 2016. The group consisted of four members: Bom, CL, Dara, and Minzy. Known for revolutionizing the girl group standard in K-pop, experimentation across musical styles, their fashion and live performances, 2NE1 was considered one of the most successful and influential South Korean girl groups during their career. Their discography and live performances have caught the attention of numerous publications worldwide, including The New York Times, who named 2NE1's New Evolution Global Tour stop at the Prudential Center in New Jersey as one of the "Best Concerts of 2012". 2NE1 has reportedly sold a cumulative total of over 66.5 million records, which would make them one of the best-selling girl groups of all time.
The group was first unveiled to the South Korean public in March 2009, after appearing alongside labelmate Big Bang on the promotional single "Lollipop". 2NE1 rose to fame with the release of their debut eponymous extended play 2NE1 (2009), which produced the lead singles "Fire" and "I Don't Care". Both singles instantly received positive reception, bringing the group to national attention and achieved success in both South Korea and other parts of Asia. "I Don't Care" received the Song of the Year award at the 2009 Mnet Asian Music Awards, making them the first idol group to receive a daesang award in the same year of their debut. Throughout their career, 2NE1 amassed prominent digital sales and garnered a record nine number-one hits on the Gaon Digital Chart—the most among any idol group at the time, which include "Go Away", "I Am the Best", "I Love You", and "Come Back Home".
2NE1 followed up their debut EP with the release of their first studio-album To Anyone (2010) and 2011 sophomore EP, the latter of which produced the four chart-topping singles "Don't Cry", "Lonely", "I Am the Best" and "Ugly". Following their 2012 single "I Love You", the group embarked on their New Evolution Global Tour, which made stops in 11 cities in seven countries in Asia and North America, and set a milestone in the industry for being the first world tour for a K-pop girl group. Their critically successful final studio album Crush in 2014 became the highest charting K-pop album on the Billboard 200 for more than two years, peaking at number sixty-one.
The quartet also conducted a parallel career in Japan, first releasing Nolza (2011) and following up with the studio albums Collection (2012) and the Japanese version of Crush (2014). Following a long hiatus, Minzy announced her departure from the group in April 2016, while the remaining members officially disbanded that November. Their final single "Goodbye" was released on January 21, 2017.