Proportion of time that a system or application is usable. Often given as a percentage (e.g. 99.9%) or as maximum downtime per year.
High availability is critical for business applications: outages block work and can damage trust. Operators secure it through redundant servers, load balancing and monitoring. SLAs define uptime targets and consequences if they are not met. When choosing SaaS, clear availability commitments and status pages should be considered.
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