What is the Medical Representative and what is his job?

They work for a company trying to sell Pharm and specific drug to doctors and hospitals. They are rather as a seller more than anything. You will see some of them are real doctors, but most of them have college degrees non-clinical. They do not see patients, especially interacting with doctors and hospital staff trying to sell your product.

Medical representative  

Is a type of a person selling or medical advice or health. Although they are not real doctors, but they do have some knowledge about health and medicine.

Usually know what kind of medicine

To give to certain diseases and may recommend to the available drugs for their patients. Their work is similar to that of marketing, but acts as a second doctor and their survival depends on the sales job you can accomplish each day.