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it is a type of identity card given by the government of India to identify him/her as citizen of india
That is because 1 is the identity element of numbers with respect to multiplication.
"What" is the interrogative question that asks for a thing with given identity or aspects, e.g. "What is the result?" "What is the color of the house?" "What" may also ask for the verb identity to a given activity, e.g. "What happened to the car?" "What was the man doing?" Other than applied to a title or name ("What name was drawn?"), the corresponding interrogative for persons (or anthropomorphisms) is "who". "What" normally applies only to non-human living things and inanimate objects.
One is the multiplicative identity or the identity of/for multiplication.
It is the additive identity.