This document discusses depression and suicide from several perspectives. It defines depression as a state of sadness resulting from life events like loss or failure. It outlines the diagnostic criteria for depression from the DSM-IV and ICD-10, including symptoms like depressed mood, loss of pleasure, changes in appetite and sleep, feelings of worthlessness, and thoughts of death. The document also discusses potential causes of depression, like genetics, chemical imbalances, life stressors, and cognitive biases. It notes the prevalence of suicide worldwide and risk factors like gender, method, and country. Finally, it provides suicide statistics specifically for Bangladesh and identifies vulnerable groups like adolescents, the elderly, the poor, and those living in rural areas.