Constitutional and administrative laws are the areas of law which establish and regulate the institutions of government within states. They also encompass the internal governance of supranational legal orders. They are increasingly concerned with the relationship between internal and external legal norms and the interaction between multiple layers of government within and beyond states.
Both the constitutional and administrative law is a part of the public law in the modern State. It is logically impossible to distinguish between administrative law from constitutional law and all attempts to do so are artificial. Till recently, the subject of administrative law was dealt with & discussed in the books of constitutional law and no separate & independent treatment was given to it.