Nostalgia is a sentimental longing for the past, often triggered by memories of happy times or significant experiences. It can evoke feelings of warmth and comfort, reminding individuals of cherished moments, such as childhood memories or family gatherings. This emotional response can be sparked by various stimuli, including music, photographs, or familiar scents. People often experience nostalgia when they encounter items or media from their past, like old toys, classic movies, or favorite songs. While nostalgia can bring joy, it may also lead to a sense of loss or yearning for times that have changed, highlighting the bittersweet nature of reminiscing.