What's the difference between psychologists, psychotherapists and psychiatrists?

Mental health drs:: Psychiatrists are medical doctors (M.D. Or D.O.) who focus primarily on mental illness. They can prescribe medication. Psychologists have a doctoral degree (pH.D., psy.D. Or ed.D.) in psychology. They have more extensive training than any other profession in non-drug methods of identifying & treating psychological & emotional problems. Psychotherapist is a generic term.

Therapy vs meds: Speaking very generally, most psychologists hold either a PhD or a PsyD degree (I hold both) and practice psychotherapy. Psychiatrists hold either an MD or a DO degree, and they prescribe psychotropic medications, and generally do not do all that much therapy these days, but years ago psychiatrists would do both. Social workers, psychiatrists, and psychologists all do psychotherapy.