President (government title) – Wikipedia

President is a common title for the head of state in most republics.. The functions exercised by a president vary according to the form of government.In parliamentary republics, they are usually, but not always, limited to those of the head of state and are thus largely ceremonial.In presidential, selected parliamentary (e.g. Botswana and South Africa), and semi-presidential republics, the …

https://en.wikipedia.org/wiki/Mr._President_(title)