Defining depression and its impact on mental health: Depression, also known as major depressive disorder, is a mood disorder characterized by persistent feelings of sadness, hopelessness, and loss of interest or pleasure in activities that were once enjoyed. It affects how individuals think, feel, and behave, leading to a significant disruption in their daily functioning. The impact of depression on mental health can be severe, influencing various aspects of life, including relationships, work, and personal well-being.