N.I.E. is an abbreviation for Número de Identidad de Extranjero, which translates as: Foreigners’ Identification Number.
The NIE is an all-purpose identification and tax number in Spain.
You will need an NIE number for any official or legal process in Spain. The number is for each individual and cannot be used to identify anyone but yourself.
(Note: If you need an NIE Number for more than one person, view the NIE Number x2 product).