This chapter explores the content, triggers, and functions of nostalgia through seven methodologically diverse studies. Studies 1 and 2 examine the content of nostalgic experiences, finding that they typically involve the self as a protagonist in interactions with close others or in significant events, and that these experiences often contain more positive than negative affect, with redemption sequences (from negative to positive) being more common than contamination sequences (from positive to negative). Studies 3 and 4 investigate the triggers of nostalgia, revealing that it occurs in response to negative mood and loneliness. Studies 5, 6, and 7 explore the functions of nostalgia, showing that it bolsters social bonds, increases positive self-regard, and generates positive affect. These findings collectively highlight the key aspects of nostalgia and its significance in various psychological contexts.This chapter explores the content, triggers, and functions of nostalgia through seven methodologically diverse studies. Studies 1 and 2 examine the content of nostalgic experiences, finding that they typically involve the self as a protagonist in interactions with close others or in significant events, and that these experiences often contain more positive than negative affect, with redemption sequences (from negative to positive) being more common than contamination sequences (from positive to negative). Studies 3 and 4 investigate the triggers of nostalgia, revealing that it occurs in response to negative mood and loneliness. Studies 5, 6, and 7 explore the functions of nostalgia, showing that it bolsters social bonds, increases positive self-regard, and generates positive affect. These findings collectively highlight the key aspects of nostalgia and its significance in various psychological contexts.