This document discusses citizenship and defines key related terms. It explains that citizenship denotes membership in a political society which implies duties of allegiance and protection. Citizens enjoy full civil and political rights within their state. Nationality is broader and includes citizens as well as others who owe allegiance but are not citizens. There are two main ways to acquire citizenship - by birth under jus sanguinis or jus soli principles, or through naturalization. The Philippine constitution outlines its citizenship laws regarding natural-born citizens and those who can become citizens.