What is the meaning of availability in the CIA triad?

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Availability means ensuring systems and data are accessible to authorized users when they need them. This is achieved through measures that keep services up and responsive, such as redundancy, backups, and disaster recovery planning so that a failure doesn’t block access. For example, backup copies let you restore data quickly after a problem, and redundant servers prevent a single outage from taking the system offline. The other options describe protecting who can see information (confidentiality) or tracking actions (auditing), rather than ensuring access, so they don’t define availability.