Psychotherapy is a treatment that involves a talking relationship between a therapist and patient. There are many forms of psychotherapy like cognitive Behavioral psychotherapy, psychodynamic (psychoanalytic) psychotherapy, family therapy, marital Therapy, cognitive Analytical Therapy (CAT), Interpersonal Therapy (IPT) and Counselling.
Psychologist has a degree in clinical psychology, and treats psychiatric disorders and emotional difficulties with psychotherapy.
Some psychologist are trained in doing psychological testing and psychometric assessments including Educational Assessment (Testing for Intellectual Difficulties like IQ test..), testing for Attention Deficit Hyperactivity Disorder (ADHD), Screening and assessment of Autism Spectrum Disorders (ASD), Personality assessments and others.