Publisher Summary Cognitive therapy is a form of psychotherapy that posits that how an individual perceives and interprets events strongly influences how that person responds emotionally and behaviorally. It combines cognitive and behavioral techniques to teach patients to challenge biased perceptions and the underlying assumptions that may cause them to distort current situations. It also maintains that significant life experiences shape core beliefs about the self and the world, which in turn, affect how new information is incorporated. It is best known as an effective treatment for unipolar depression. Outcome studies have demonstrated its usefulness in the treatment of depression and have suggested that cognitive therapy has some preventive effects against future depressive episodes. Current research is investigating whether cognitive therapy can prevent a first episode of depression among those at risk. In addition, cognitive therapy techniques are also being used in schools to promote cooperation and self-esteem. Thus, this form of therapy can be used to promote mental health at the individual and community levels.