Such a simple title, such a powerful lyric. Tensions were running high while recording Achtung Baby, and the band was reportedly on the brink of breaking up. "One" is the song that brought them back together, essentially saving the band.
The lyrics can be interpreted in several ways: a gay son coming out to his father; a relationship in which a couple loves each other but have hurt each other too much to stay together; or Bono's rocky relationship with his own father.
Whatever the meaning, the song reminds us that all humans are equal and that we need to help those less fortunate: "We're one, but we're not the same/We get to carry each other, carry each other." "One" topped Billboard's Mainstream Rock and Modern Rock charts and has been played at every U2 concert since its debut on the ZooTV tour in 1992.