What is the difference between CEO MD?

MD

Managing director is the term used for the chief executive of many limited companies in the United Kingdom, Commonwealth and some other English speaking countries. The title reflects their role as both a member of the Board of Directors but also as the senior manager.

CEO

A Chief Executive Officer (CEO), or Chief Executive, is the highest-ranking corporate officer, administrator, corporate administrator, executive, or executive officer, in charge of total management of a corporation, company, organization or agency.