Psychology is the study of the mind and behavior, according to the American Psychological Association. It is the study of the mind, how it works, and how it affects behavior
The APA ads that it "embraces all aspects of the human experience, from the functions of the brain to the actions of nations, from child development to care for the aged."
Psychologists and psychiatrists work together to help people with mental health conditions, but they are not quite the same.
A psychologist treats a patient through psychotherapy, helping to relieve symptoms through behavioral change. The role of the psychiatrist, who is a medical doctor, focuses more on prescribing medication and other interventions to manage mental health conditions.