title: List of Billboard 200 number-one albums of 2017
context: Taylor Swift's Reputation was the best selling album of 2017. Singer Ed Sheeran's ÷ is the second best-selling album with 451,000 album-equivalent units, of which 322,000 were pure album sales.[3] Rapper Kendrick Lamar's fourth studio album, Damn, went on to become the third best-seller with 603,000 album-equivalent units in its first week of release (353,000 in pure album sales).[4][5] In the meantime, another Canadian artist Drake's "playlist", More Life, which broke many streaming records, sustained 505,000 album-equivalent units, of which 226,000 were pure sales.[6][7] As of September 2017, the album has moved over 1,864,000 album-equivalent units in the United States, of which 352,000 were pure sales.[8]
question: What was the best selling album of 2017?
answers: Taylor Swift's Reputation