Seasonal Affective Disorder (SAD) is a type of depression that appears during specific seasons, most commonly in winter when sunlight exposure is limited. Individuals may experience low energy, sadness, oversleeping, or changes in appetite during this period. The lack of natural light disrupts the body's internal rhythms and serotonin levels, contributing to these symptoms. Light therapy, regular outdoor activity, and professional guidance can help manage SAD effectively. Recognizing the seasonal pattern allows people to prepare and take proactive steps before symptoms intensify.