what is a dni/nif mean?
NIF (NÃºmero de IdentificaciÃ³n Fiscal) This is the generic term for the tax ID number for all individuals. For Spaniards, it's the DNI plus one letter; for foreigners, it is your NIE. If you're a nonresident who has to pay taxes in Spain, you may get a NIF issued to you without having a NIE. This, of course, does not mean you get automatic residency in Spain, nor will it make it easier to get residency.
Documento Nacional de Identidad. For the Argentinean document, see Documento Nacional de Identidad (Argentina). Layout of the Spanish national ID card from 1992 to 2006 (this is the 2001 revision with extra security features). The Documento nacional de identidad (DNI) or carnÃ© de identidad is Spanish national identity card.