What is the CIF, NIF and NIF-IVA?

What is the CIF, NIF and NIF-IVA?

Knowing the definitions of CIF (Código de Identificación Fiscal), NIF (Número de Identificación Fiscal) and NIF-IVA (número de identificación del impuesto sobre el valor añadido), as well as the differences between them, is necessary when carrying out any administrative procedure.