DNI stands for 'Documento Nacional de Identidad,' which is the Spanish National Identification Number. It is a unique alphanumeric code assigned to Spanish citizens and residents for official identification purposes. The DNI is used in a variety of contexts, including government records, banking, healthcare, and online services. In cybersecurity, the DNI is considered sensitive personal information and is often targeted by cybercriminals for identity theft and fraud. Protecting the DNI from unauthorized access or disclosure is crucial, as its misuse can lead to serious privacy breaches and financial losses. Organizations handling DNI data must comply with strict data protection laws.