Behavior Therapy is a type of psychotherapy. Psychotherapy is a general term referring to therapeutic interaction or treatment contracted between a trained professional and a client or patient; family, couple or group. The problems addressed are psychological in nature and of no specific kind or degree, but rather depend on the specialty of the practitioner.
Psychotherapy aims to increase the individual's sense of his/her own well-being. Psychotherapists employ a range of techniques based on experiential relationship building, dialog, communication and behavior change that are designed to improve the mental health of a client or patient, or to improve group relationships (such as in a family).
Behavior therapy is the use of empirically demonstrated behavior change techniques to improve behavior, such as altering an individual's behaviors and reactions to stimuli through positive and negative reinforcement of adaptive behavior and/or the reduction of maladaptive behavior through its extinction, punishment and/or therapy.