"What You Know" is a Grammy Award-winning multi platinum hip hop song by Southern hip hop recording artist T.I., released as the lead single from his fourth studio album King (2006). The song also serves as the theme song to the 2006 film ATL in which T.I. stars in. The song is also played during the end credits of the film and the music video is included as a bonus feature on the DVD. The song peaked at number three in the US and was certified 2x Platinum by the RIAA.