In positive psychology, a flow is a cognitive state (also known as being "in the zone" (sports) or "in the pocket" (music)) in which a person is fully immersed in an activity. Achieving this state can help people feel greater enjoyment, creative energy, and energized focus.

Books published in the United States in English, including works in translation and other significant rereleases, between November 18, 2020, and November 17, 2021, will be eligible for the 2021 Goodreads Choice Awards.