Depression is a widespread mental health disorder characterized by persistent feelings of sadness, hopelessness, and a marked loss of interest or pleasure in daily activities. It affects millions of individuals worldwide, significantly impacting emotional well-being and physical health. Common symptoms include persistent fatigue, changes in appetite or weight, disturbances in sleep patterns, difficulty concentrating, feelings of worthlessness, and in severe cases, thoughts of death or suicide. The exact causes of depression are complex and multifaceted, typically involving a combination of genetic predisposition, neurochemical imbalances, environmental stressors, and psychological factors. Life events such as the loss of a loved one, chronic stress, trauma, or significant lifestyle changes can often trigger depressive episodes. Effective treatment for depression usually involves a comprehensive approach combining psychotherapy, medication, and lifestyle modifications. Antidepressant medications help regulate brain chemistry, while various therapeutic techniques—such as cognitive-behavioral therapy (CBT)—aid individuals in understanding and managing negative thought patterns. Lifestyle changes, including regular physical activity, proper sleep, and social support, also play a crucial role in recovery. With timely intervention and ongoing care, many people with depression can regain their mental health and lead fulfilling, meaningful lives.