Mariah Carey is an American pop and R&B singer, songwriter, record producer, and actress. She made her recording debut in 1990 under the guidance of Columbia Records executive Tommy Mottola, and became the first recording artist to have her first five singles top the U.S. Billboard Hot 100 chart. Following her marriage to Mottola in 1993, a series of hit records established her position as Columbia's highest-selling act. According to Billboard magazine, she was the most successful artist of the 1990s in the United States.

Following her separation from Mottola in 1997, Carey introduced elements of hip hop into her album work, to much initial success, but her popularity was in decline when she left Columbia in 2001. She signed to Virgin Records but was paid to leave the label the following year after a highly publicized physical and emotional breakdown, as well as the poor reception given to Glitter, her film and soundtrack project. In 2002, Carey signed with Island Records, and after a relatively unsuccessful period, she returned to the top of pop music in 2005.

Carey was born in Huntington, Long Island, New York. She is the third and youngest child of Patricia Carey (née Hickey), a former opera singer and vocal coach, and Alfred Roy Carey, an aeronautical engineer. Her mother was Irish American and her father was of Afro-Venezuelan and African American descent; her paternal grandfather, Roberto Nuñez, changed his surname to Carey to better assimilate upon moving to the United States from Venezuela. Carey was named after the song "They Call the Wind Mariah". Carey's parents divorced when she was three years old. While living in Huntington, racist neighbors allegedly poisoned the family dog and set fire to her family's car. After her parents' divorce, Carey had little contact with her father, and her mother worked several jobs to support the family. Carey spent much of her time at home alone and turned to music to occupy herself. She began singing at around the age of three, when her mother began to teach her after Carey imitated her mother practicing Verdi's opera Rigoletto in Italian.

Carey graduated from Harborfields High School in Greenlawn, New York. She was frequently absent because of her work as a demo singer for local recording studios; her classmates consequently gave her the nickname "Mirage". Her work in the Long Island music scene gave her opportunities to work with musicians such as Gavin Christopher and Ben Margulies, with whom she co-wrote material for her demo tape. After moving to New York City, Carey worked part-time jobs to pay the rent, and she completed 500 hours of beauty school. Eventually, she became a backup singer for Puerto Rican freestyle singer Brenda K. Starr.

In 1988, Carey met Columbia Records executive Tommy Mottola at a party, where Starr gave him Carey's demo tape. Mottola played the tape when leaving the party and was impressed. He returned to find Carey, but she had left. Nevertheless, Mottola tracked her down and signed her to a recording contract. This Cinderella-like story became part of the standard publicity surrounding Carey's entrance into the industry.

Carey and Tommy Mottola had become involved romantically during the making of her debut album, and in June 1993, they were married.

Kenneth "Babyface" Edmonds consulted on the album Music Box, which was released later that year and became Carey's most successful worldwide. The album maintained a presence on the Billboard 200 for a staggering 128 weeks. It yielded her first UK Singles Chart number-one, a cover of Badfinger's "Without You", and the U.S. number-ones "Dreamlover" and "Hero". Billboard magazine proclaimed it "heart-piercing easily the most elemental of Carey's releases, her vocal eurythmics in natural sync with the songs", but TIME magazine lamented Carey's attempt at a mellower work, " seems perfunctory and almost passionless Carey could be a pop-soul great; instead she has once again settled for Salieri-like mediocrity." In response to such comments, Carey said, "As soon as you have a big success, a lot of people don't like that. There's nothing I can do about it. All I can do is make music I believe in." Most critics slighted the opening of her subsequent U.S. Music Box Tour.

In late 1994, after her duet with Luther Vandross on a cover of Lionel Richie and Diana Ross's "Endless Love" became a hit, Carey released the holiday album Merry Christmas. It contained cover material and original compositions such as "All I Want for Christmas Is You", which became Carey's biggest single in Japan and, in subsequent years, emerged as one of her most perennially popular songs on U.S. radio. Critical reception of Merry Christmas was mixed, with Allmusic calling it an "otherwise vanilla set pretensions to high opera on 'O Holy Night' and a horrid danceclub take on 'Joy to the World'." It became one of the most successful Christmas albums of all time.

In 1995, Columbia released Carey's fourth studio album, Daydream, which combined the pop sensibilities of Music Box with downbeat R&B and hip hop influences. A remix of "Fantasy", its first single, featured rapper Ol' Dirty Bastard. Carey said that Columbia reacted negatively to her intentions for the album: "Everybody was like 'What, are you crazy?'. They're very nervous about breaking the formula." It became her biggest-selling album in the U.S., and its singles achieved similar success-"Fantasy" became the second single to debut at number one in the U.S. and topped the Canadian Singles Chart for twelve weeks; "One Sweet Day" (a duet with Boyz II Men) spent a record-holding sixteen weeks at number one in the U.S.; and "Always Be My Baby" (co-produced by Jermaine Dupri) was the most successful record on U.S. radio in 1996, according to Billboard magazine. Daydream generated career-best reviews for Carey, and publications such as The New York Times named it one of 1995's best albums; the Times wrote that its "best cuts bring pop candy-making to a new peak of textural refinement Carey's songwriting has taken a leap forward, becoming more relaxed, sexier and less reliant on thudding clichés." The short but profitable Daydream World Tour augmented sales of the album, which received six Grammy Award nominations.