"One Thing" is a song by the British-Irish boy band One Direction from their debut studio album, Up All Night (2011). It was released in various countries by Syco Music on 6 January 2012, as their second single, and as their third single in the UK on 13 February 2012. Additionally, Columbia Records sent it to contemporary hit radio playlists on 22 May 2012 as their second single in the United States. Written by Savan Kotecha and its producers, Carl Falk and Rami Yacoub, initially, the upbeat pop rock number was written as two different songs. As both tracks had elusive attributes, the trio decided to merge the two into one song. The lyrical content regards the protagonist's infatuation with a significant other.