Psychotherapy (also psychological therapy or talking therapy) is a psychological method based on regular personal interaction. to help a person change behavior, increase happiness, and overcome problems. It aims to improve an individual's well-being and mental health, resolve or mitigate troublesome behaviors, beliefs, compulsions, thoughts, or emotions, and improve relationships and social skills. There are numerous types of psychotherapy designed either for individual adults, families, or children and adolescents. Certain types of psychotherapy are considered evidence-based for treating some diagnosed mental disorders, and other types have been criticized as pseudoscience. 
There are hundreds of psychotherapy techniques, some being minor variations, while others are on very different conceptions of psychology.  Most involve one-to-one sessions between the client and therapist, but some are conducted with groups, including families.Psychotherapists may be mental health professionals such as psychiatrists, psychologists, mental health nurses, clinical social workers, marriage and family therapists, or professional counselors. Psychotherapists may also come from different backgrounds, and depending on the jurisdiction may be legally regulated, voluntarily regulated, or unregulated.