$INIT Depression is a serious mental disorder that affects how a person feels, thinks, and acts. It often causes persistent feelings of sadness, hopelessness, and a lack of interest or pleasure in daily activities. People with depression may have problems with sleep, appetite, energy level, and concentration. It can be caused by a combination of genetic, biological, environmental, and psychological factors. Depression is not just a bad mood for a few days — it is a long-lasting condition that requires proper care and support. Treatment may include therapy, medication, lifestyle changes, and strong social support to help individuals recover and manage symptoms effectively.