Most Master of Science (MSc, M.Sc.) or Master of Arts (MA or M.A.) in business or management are aimed at students that have just finished their bachelor in business.
MSc students are normally not expected or required to have any former work experience.
MBA Students are usually expected to have relevant professional experience.
Many Business Schools require at least three years of relevant postgraduate professional experience.
An MBA is geared towards leadership, managerial and entrepreneurial skills.