What is the difference between a codified and uncodified constitution?

A constitution is a set of rules and principles which set out the relationship between a state’s political institutions. It establishes where sovereignty lies in the political system, as well as defining the limits on government power and the rights of the people. Most states across the world have codified constitutions, which are often the result of a dramatic historical event like a revolution. A codified constitution is one which is written down within a single document, for example, the Constitution of the United States (1787).Some countries, including New Zealand, Israel, and the United Kingdom have constitutions which are uncodified. This does not necessarily mean that they are unwritten, merely that the constitutional framework is not set down in a single document. They tend to be the result of evolution over centuries. The UK’s constitution, for instance, is contained in documents such as Magna Carta (1215), The Bill of Rights (1689), and the Parliament Acts (1911 & 1949) as well as unwritten sources like constitutional conventions and royal prerogatives.