Swim is a 2026 single by BTS and the lead single from their sixth Korean-language studio album, Arirang, the group's first album since reuniting after their military service. The song blended alternative pop and synth-pop and was written by RM, Ryan Tedder and Pdogg among others. Swim reached number one on the Hot 100, and the album Arirang topped the Billboard 200. It also became the first foreign number one on the Brasil Hot 100 since that chart relaunched in 2023. A week later, the remix album Keep Swimming followed.