In terms of law naturalisation is the proceed whereby an individual of his own free will and energetically acquires a nationality which is not his or her nationality at the time of birth. It is also mostly connected with monetary migrants or refugees who have moved to a particular nation and resided there as an unknown. They have also in turn chosen to be citizen of that nation but this is only possible only when they meet the essential requirements. On the other hand the opposite of naturalization is denaturalization. In denaturalization a citizen is deprived of his or her citizenship from the required state.