The colour-coding also appears on the following map, representing the same government categories. The list is colour-coded according to the type of government, for example: blue represents a republic with an executive head of state, and red is a constitutional monarchy with a ceremonial head of state. There is also a political mapping of the world that shows what form of government each country has, as well as a brief description of what each form of government entails. This is a list of sovereign states by system of government.