Treatment that attempts to replace maladaptive or irrational cognitions and behaviors with more adaptive, rational ones. Therapists are not trying to change the behavior, they are trying to change the thought process
For example, if a patient is jealous, rather than changing their behavior, a cognitive-behavioral therapist would ask “Why are you jealous? What happened that led you to be jealous? What are the trigger points for you to exhibit certain jealous behaviors?” → in other words, they find out what you are thinking about when you are jealous and change your thought process into something more realistic
More effective than no or placebo treatment. At least or more effective than psychodynamic and humanistic therapies. In general, it's about as effective for most problems