"You're the One That I Want" is a song performed by American actor and singer John Travolta and Anglo-Australian singer, songwriter and actress Olivia Newton-John for the 1978 film version of the musical Grease.
It was written and produced by John Farrar, and released in May 1978 as the second single from Grease: The Original Soundtrack from the Motion Picture. The song is one of the best-selling singles in history to date, having sold over 4 million copies in the United States and the United Kingdom alone, with estimates of more than 15 million copies sold overall.
Danny Zuko (Travolta), leader of the T-Birds, has recently lettered in cross-country running in an effort to win back his estranged girlfriend Sandy Olsson (Newton-John); unbeknownst to him, Sandy, who has been conflicted about her upright and proper etiquette in a school full of brash greasers, has herself transformed into a greaser queen to win back Danny.
In the song, Danny expresses pleasant shock and arousal at Sandy's transformation, with Sandy responding that Danny must "shape up" to prove himself capable of treating her the right way.