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Purpose is the second studio album by South Korean singer Taeyeon. It was released through SM Entertainment on October 28, 2019. It features 12 tracks, including the Gaon number-one single "Four Seasons" and its B-side "Blue" alongside ten new tracks, including the title track "Spark". On January 15, 2020, a repackage edition of Purpose was released including three new songs, including title track "Dear Me". Musically, it is a pop record that contains influences of ballad, R&B, blues and jazz. The album was originally set to be released on October 22, 2019, but was postponed until October 28 due to the passing of Sulli.

Purpose was met with generally positive reviews from music critics and debuted at number two in South Korea, selling over 154,258 copies. The album received nominations for Disc Bonsang and Disc Daesang at the 34th Golden Disc Awards, while its single "Four Seasons" won Digital Bonsang, and was also nominated for Digital Daesang. Purpose appeared on numerous year-end best music lists of 2019.