"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.