Depression is a serious but treatable mental health problem that affects about 30% of the world's adult population over 25 years of age. Symptoms include feelings of exhaustion, insomnia, lack of interest, loneliness, and suicidal thoughts. It can be caused by stressful life events or situations as well as biological factors like changes in the brain. Early treatment from medical experts, which may include antidepressants, psychotherapy, electroconvulsive therapy, and lifestyle changes, can help reverse depression in 95% of cases. Certain groups like women, Indians, and students face higher risks of depression due to hormonal, social, and academic pressures. Seeking help from family, friends, and medical professionals is important for managing depression effectively.