Depression, also known as major depressive disorder (MDD), is a serious mental health condition characterized by persistent and pervasive feelings of sadness, hopelessness, and a lack of interest or pleasure in activities. It is more than just feeling down or having a “bad day.” Depression can significantly impact a person’s daily life, relationships, and well-being. It causes severe symptoms that affect how a person feels, thinks, and handles daily activities, such as sleeping, eating, or working.