Over the past few centuries, the idea of citizenship has gained vast popularity. Citizenship is a person's commitment to a state. Each state chooses the circumstances in which it will recognise people as citizens and the circumstances in which that recognition will be revoked. A state's designation of a person as a citizen typically entails the grant of civil, political, and social rights that are not available to non-citizens.

The right to a passport, the freedom to enter and exit the nation or countries of citizenship, the right to reside in and engage in employment inside those countries are generally seen as the fundamental rights that flow from citizenship. While some nations allow residents to hold multiple citizenships, others require exclusive allegiance.

Some intergovernmental organisations have taken the idea and language of citizenship to a global scale, where it now refers to all of the people who live in the member nations of those organisations. At this level, citizenship is a secondary concept; rights are derived from national citizenship.

In this paper, I shall be exploring the meaning and historical evolution of dual citizenship and multiple nationalities by way of various customary practices, treaties and relevant international cases. Furthermore, I shall also be exploring the various types of methods of acquiring citizenships of different nation states.