Billboard Decade-End is a series of music charts reflecting the most popular artists, albums, and songs in the United States throughout a decade. Billboard first published a decade-end ranking in the 1980s, based on the magazine reader's votes, with Madonna becoming the Pop Artist of the Decade. In December 1999, Billboard published decade-end lists based on statistical performances on weekly Billboard charts, with Mariah Carey being dubbed the Pop Artist of Decade. Other artists receiving the honor in the following decades are Eminem (2000s) and Drake (2010s).

Mariah Carey is an American singer, songwriter, record producer, and actress. An influential figure in popular music, she is known for her five-octave vocal range, melismatic singing style, and signature use of the whistle register. Carey is also credited with influencing vocal styles, merging hip-hop with pop through her collaborations, popularizing remixes, and helping break down racial barriers for multiracial Americans in popular culture. Referred to as the "Songbird Supreme" by Guinness World Records, she was ranked as the fifth greatest singer of all time by Rolling Stone in 2023, and has been dubbed the "Queen of Christmas" for the enduring popularity of her Christmas music, particularly the 1994 song "All I Want for Christmas Is You", which is the best-selling holiday song by a female artist.