Citizenship by naturalization refers to the process by which a non-citizen becomes a legal member of a state. It is different from citizenship by marriage or registration, which involve different criteria for obtaining citizenship. Naturalization usually involves satisfying constitutional requirements, such as residing in the country for a certain period of time, passing a citizenship test, and demonstrating knowledge of the country's language and customs. It is an honorable way of attaining citizenship, but it is not an honorary means. Citizenship by birth, on the other hand, is when someone is automatically granted citizenship by being born in a particular country, regardless of their parents' nationality. Naturalization is a legal process that involves the judiciary, but it is not certification for citizenship by birth.