What's the difference between psychology and psychiatry?

Which one is the one that's basically like a counselor? And I know psychiatrist can prescribe medicine and psychologist can't? But are psychiatrist still able to do jobs like counselling and talking to patients. I really need to know so that I can choose my major and career choice. I want to be able to talk with patients and be like a counselor kinda (like work in one of the therapist offices or a psychiatric home) but I want to be able to prescribe medicine if I need to.