Learned helplessness is a psychological condition in which an individual learns to believe that they have no control over the outcomes of their situation, leading to feelings of powerlessness and passive behavior. This concept is significant in understanding mood disorders, particularly depression, as it highlights how experiences of failure or trauma can shape one's expectations about the future and influence emotional states. It demonstrates the interplay between cognition and behavior, revealing how a person's perception of their ability to influence events can affect their mental health.