What Do You Mean?" is a song recorded by Canadian singer Justin Bieber for his fourth studio album Purpose (2015). The song was released on August 28, 2015, as the album's lead single by Def Jam. Written by Bieber, Jason "Poo Bear" Boyd and Mason Levy, the song was produced by MdL and co-produced by Bieber. "What Do You Mean?" is a pop and tropical house song, with its instrumentation consisting in light flourishes of panpipes, looped vocal samples, piano chords, fervent synths, bass and "slick beat" elements with the sound of a clock ticking, while Bieber uses a smooth, soulful vocal. Lyrically, "What Do You Mean?" talks about not being able to figure out the opposite sex with Bieber asking a girl why her body language is conflicting with her words.
It was featured in several year-end lists of best songs of 2015. Commercially, the song topped the charts in several countries, including Canada, Ireland, New Zealand and Norway. In Australia, the United States and the United Kingdom, "What Do You Mean?" was Bieber's first number-one single. The song's music video features Bieber in bed with a young woman and getting kidnapped by masked men, as well as an appearance from actor John Leguizamo.