Computer security is a branch of computer technology known as information security as applied to computers and networks. The objective of computer security includes protection of information and property from theft, corruption, or natural disaster, while allowing the information and property to remain accessible and productive to its intended users. The term computer system security means the collective processes and mechanisms by which sensitive and valuable information and services are protected from publication, tampering or collapse by unauthorized activities or untrustworthy individuals and unplanned events respectively. The strategies and methodologies of computer security often differ from most other computer technologies because of its somewhat elusive objective of preventing unwanted computer behavior instead of enabling wanted computer behavior.

La sécurité des systèmes d’information (SSI) est l’ensemble des moyens techniques, organisationnels, juridiques et humains nécessaires et mis en place pour conserver, rétablir, et garantir la sécurité de l'information et du système d'information.

Datasäkerhet är den delen av IT-säkerhet som avser förebyggande och upptäckt av obehöriga åtgärder av användare av datorsystem.

Bezpieczeństwo teleinformatyczne – zbiór zagadnień z dziedziny telekomunikacji i informatyki związany z szacowaniem i kontrolą ryzyka wynikającego z korzystania z komputerów, sieci komputerowych i przesyłania danych do zdalnych lokalizacji, rozpatrywany z perspektywy poufności, integralności i dostępności.

La Sicurezza informatica è quella branca dell'informatica che si occupa della salvaguardia dei sistemi informatici da potenziali rischi e/o violazioni dei dati. I principali aspetti di protezione del dato sono la confidenzialità, l'integrità e la disponibilità.