A set of rules that govern the basic structure and operation of institutions of governance in a state. In a modern constitution the rules will also provide for the basic rights of people within the state, and may include some guiding principles for national laws and policies more generally. In most countries the word refers to a particular enactment that contains those rules. But some countries have no enactment that is called the constitution, a few have several that together make up the constitution, and in a few the constitution comprises a mixture of conventions and laws.