"Sweetheart" is a song originally recorded by American singer Rainy Davis. It was written by Davis and Pete Warner, and produced with Dorothy Kessler. The track was released in 1986 by independent record label SuperTronics as a single from Davis's 1987 studio album Sweetheart. A freestyle, hip hop pop, and synth-funk song, "Sweetheart" appeared on R&B and dance music-based record charts in the United States.
American singer Mariah Carey recorded a cover version with American rapper Jermaine Dupri (credited as JD) for his debut album, Life in 1472 (1998), and her first greatest hits album, #1's (1998). So So Def and Columbia Records released it as the third single from the former album on September 7, 1998. Carey was inspired to create a remake of "Sweetheart" as she liked listening to the song as a teenage girl. Critics categorized the cover as a dance, hip-hop, and R&B song, and its instrumental features synths and bass runs. The lyrics describe a woman's desire for a person with whom to share a romance.
"Sweetheart" was promoted with a music video directed by Hype Williams in Spain. Although American and British music magazines predicted it would experience success on major record charts, its performance in those countries was restricted to the US Billboard Bubbling Under Hot 100 and UK club charts due to the absence of a commercial release. It fared better in mainland Europe, where it charted in the top twenty on Dutch, German, and Swiss record charts. In reviewing "Sweetheart", music critics focused on Carey's vocal performance, Dupri's rapping style, and the cover's perceived sexual nature.