The War is the fourth studio album of the South Korean boy band EXO. It was digitally published on July 18, 2017 and physically on July 19 by S.M. Entertainment under the distribution of Genie Music. The album includes a total of nine songs including the lead single "Ko Ko Bop". "The War" got the highest number of pre-orders at that time for a K-pop album, with more than 800,000 physical copies. Twenty-four days later to be released, "The War" became EXO's fourth consecutive studio album to have sold more than a million copies. On September 5, 2017, the group released the reissue of the album under the name of The War: The Power of Music.