Theory:

Single citizenship

Federal states like the USA and Switzerland has dual citizenship. (National citizenship and State citizenship).
Our Indian Constitution provides for only Single citizenship, that is, Indian citizenship.
In India, all citizens, irrespective of the state in which they are born, enjoy the same political and civil rights of citizenship all over the country.
  
Important!
As per the order precedence, President is the first citizen of our country.
Rights and Duties of Citizen
Our Constitution confers the following rights for the citizen of India.
■ Fundamental Rights
■ Right to vote in the election to the Lok Sabha and the State Legislature
■ Right to hold certain public offices
■ Right to become the Member of Parliament and State Legislature.
While we enjoy rights conferred on us, we must also follow the duties.
According to the 42 Amendment of our Constitution, a set of Fundamental duties are prescribed for all citizens of India. For e.g. respecting the rights, beliefs and opinions of others, defending the country, respect and obey state and local laws and so on.
Alien and immigrant are two terms that are used to refer to non-nationals of a country.
Alien refers to all non-citizens or non-nationals residing in a country. e. g. tourists, foreign students
Immigrant refers to an alien who has been granted the right to reside and work permanently without restriction in a particular country.
Global Citizenship:
 
Global citizenship is an idea that everyone, no matter where they live, is part of a worldwide community rather than a citizen of a particular nation or place.
 
citti.jpg
Global citizenship
 
Our Constitution of India has introduced Single citizenship. It provides uniform rights for the people of India to promote the feeling of fraternity and unity among them to build an integrated Indian nation.