Depression is an emotional/psychological disorder characterized by feelings of anguish and deep sadness. Sadness is normal, we all feel sad at some point, but when we can't manage emotions, our inner peace is affected, and we lose the energy that moves us to live a happy life. Depression, when untreated, can become a spiral of anguish so severe that death may seem like the only way out.
Please note that this is only a self-test with limitations. For a correct diagnosis and treatment you should consult a healthcare professional.