Explanation:

How a person can lose Nationality?
The Citizenship Act envisages three situations under which a citizen of India may lose his Indian nationality. Section 9 deals with the automatic termination of citizenship and Section 10 deals with the deprivation of citizenship.
        By Renunciation: If any citizen of India who is also a national of another country renounces his citizenship through declaration of in the prescribed manner, he ceases to be Indian Citizen.
        By Termination: Any person who acquired Indian Citizenship by naturalization, registration or otherwise, has voluntarily acquired citizenship of another country at anytime between January 26, 1950 to December 30,1955, shall have ceased to be an Indian Citizen.
        Deprivation: Section 10 of the Citizenship Act 1955 empowers the government to deprive a citizen of his citizenship by issuing an order. However this power may not be used in case of every citizen. It applies only to those, who acquired Indian Citizenship. This might be because of obtaining citizenship on false documentations etc.