A graduate school is a school in a university that offers programs for advanced degrees and also study leading to degrees after the bachelors degree.
A college student may attend a graduate school after finishing his undergrade education.
The degrees are ranged from master degrees (M.S./M.Sc., M.A., M.Ed., etc.), doctorate (Ed.D., Ph.D., Th.D., D.Sc., D.M.A.) or other qualifications.