"SOS" is a song by Barbadian singer Rihanna, and included in her second studio album, A Girl like Me (2006). It was released on February 14, 2006 through Def Jam Recordings as the lead single of the album. "SOS" was written by J. R. Rotem and E. Kidd Bogart, with additional credit assigned to Ed Cobb for inspiration built around a sample of Soft Cell's 1981 recording of "Tainted Love". This song was written by Cobb in 1965, later influencing the creation of "SOS". Production of the dance-pop song was handled by Rotem. Critical reception of "SOS" was generally positive, with the majority of music critics praising the inclusion of the "Tainted Love" sample. Some critics compared "SOS" to Rihanna's debut single, "Pon de Replay".

Robyn Rihanna Fenty is a Barbadian singer, businesswoman, and actress, one of the most prominent recording artists of the 21st century. Rihanna signed with Def Jam Recordings in 2005 and found mainstream recognition following the release of her first two studio albums, Music of the Sun (2005) and A Girl Like Me (2006). Both influenced by Caribbean music, the albums quickly earned commercial success and peaked within the top ten on the US Billboard 200 chart. Her third album, Good Girl Gone Bad (2007), incorporated elements of dance-pop, and established her status as a prominent music industry icon. Its lead single "Umbrella" peaked atop the US Billboard Hot 100, won her first Grammy Award from three nominations, and remains one of the best-selling singles of all time.