MBBS is basically a Bachelors Degree program in Medicine and Surgery and hence, MBBS stands for Bachelor of Medicine and Bachelor of Surgery.The course is pursued by candidates who have studied Biology, Physics, Chemistry and English in the higher secondary level.Before one could pursue the course, he/she needs to qualify an Entrance Examination which is conducted on national level, state level as well as by institutes offering the course.

Bachelor of Medicine, Bachelor of Surgery, or in Latin Medicinae Baccalaureus, Baccalaureus Chirurgiae (abbreviated in various ways, viz. “BMBS”, MB BChir, BM BCh, MB BCh, MB ChB, MB BS, BM, BMed, MBBS etc.), are the two first professional degrees awarded upon graduation from medical school in medicine and surgery by universities in various countries that follow the tradition of the United Kingdom. The naming suggests that they are two separate degrees; however, in practice, they are usually treated as one and awarded together. Usually, students who have graduated with a “Bachelor of Medicine” degree may also practice surgery, because it is equivalent to the “Bachelor of Medicine, Bachelor of Surgery” degree. – Source wikipedia

MBBS is Bachelor of Medicine and Bachelor of Surgery. In theory these are two separate degrees, but in practice the two are usually treated as one. The degrees are the British equivalent of the American M.D. The basic or degree level qualification for a medical profession is MBBS (Bachelor of Medicine And Bachelor of Surgery) which is of 5 1/2 years duration (including 1 year internship).