2NE1, also known as 2NE1 1st Mini Album, is the self-titled debut extended play of South Korean girl group 2NE1. It contains seven songs composed and produced by Korean producers Teddy Park and Kush. The album was released July 8, 2009.

2NE1's first song was "Lollipop", digitally released on March 27, 2009. The song was created for LG Cyon to promote their Lollipop phone, and it was a joint release with Big Bang; the commercial/music video debuted on March 28, 2009. Although it was not a promoted single (as it was an advertisement song, there were problems with network chart eligibility), "Lollipop" proved to be a strong chart hit, going to #1 on various online charts and topping music television network M.Net's online chart for four weeks in a row. It was also profiled in Perez Hilton's blog. However, questions were raised about the group's future, as the song's success was attributed to the popularity of Big Bang.

On April 30, Yang Hyun-suk revealed that 2NE1's debut song would be a hip hop/reggae song, and that it would be digitally released on May 6, 2009. Titled "Fire", the song was fully written and produced by 1TYM's Teddy Park. Teasers of the song were released on their official website at the beginning of May, with a 20-second clip released on May 1.

On its first day, it recorded 50,000 sales in pre-orders. Their debut was a success on the Korean charts, and it headed straight to number 1 for its debut week, in which It sold 13,675 copies.

YG stated that the EP had already reached the 80,000 sales mark within 2 weeks, which is impressive since 2NE1 is only a rookie. By the end of 2009 2NE1 sold approximately 100,000 copies. It continued to show strong sales by charting on the 2010 year end chart for Gaon, selling an additional 40,949 copies. Total sales for the release are believed to be 140,949 copies.

The group's first performance of the song was on May 17, 2009, on SBS's Inkigayo. beginning the group's activities. Their first performance was also included in Perez Hilton's blog once again, showing his interest towards the group.

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