According to the Indian Citizenship Act, there are 5 ways to acquire Indian Citizenship. 

They are: 

i) By birth: Anybody born in India on 21 January 1950 or later will be an Indian citizen. 

ii) Citizenship by heredity: Anybody born outside India on 21 January 1950 or later will be given Indian citizenship if his father was an Indian citizen at the time of his birth. 

iii) Citizenship by Registration: The following can get Indian citizenship through registration: 

• People of Indian origin who have stayed in India continuously for 6 months before submitting the application for registration. 
• People of Indian origin who are staying outside undivided India. 
• Wives of the Indian citizens. 
• Minor children of Indian citizens. 
• Adult citizens of Commonwealth Countries or the Republic of Ireland. 

iv) Citizenship through Long Stay: A foreigner can get Indian citizenship through long stay here subject to certain conditions. 

v) Citizenship through regions becoming part of India: If any region becomes part of India, the government has the authority to declare the people of that region as Indian citizens.