추억 (Nostalgia) is a sentimental longing for the past, often triggered by memories of specific experiences, places, or people. It can evoke feelings of warmth and happiness, as individuals recall moments that shaped their lives. This emotional response can be linked to various stimuli, such as music, photographs, or familiar scents. Nostalgia serves a psychological purpose, helping people connect with their identity and providing comfort during challenging times. It can foster social bonds, as sharing nostalgic memories with others often strengthens relationships. Overall, nostalgia is a universal experience that reflects the human tendency to cherish and remember the past.