What is the difference MS degree and MD degree in USA?

An MS (Master of Science) degree is a graduate-level program focused on scientific and technical subjects, typically requiring coursework and a thesis or research project, and it often takes 1-2 years to complete. In contrast, an MD (Doctor of Medicine) degree is a professional degree for physicians, involving extensive medical training, clinical rotations, and a focus on patient care, usually taking four years to complete followed by residency training. While an MS can lead to various careers in science and research, an MD is specifically designed for those pursuing a career in medicine.