This document defines key concepts related to constitutions and the nature and purpose of the Philippine Constitution. It discusses that a constitution is the fundamental law that establishes the framework and principles of government. The Philippine Constitution specifically serves as the supreme law, binding on all citizens and government bodies. It also establishes the basic division of powers and protects individual rights from arbitrary actions of those in authority. The document further describes that the Philippine Constitution is a written, conventional, and rigid constitution, as it was drafted by a constitutional commission and can only be amended through a difficult process.