Responsiveness
Availability describes the state in which a website is online and accessible at all times, without outages or downtime. It is essential in hosting , as interruptions harm SEO rankings and lead to user loss; measures such as 99,9% uptime guarantees ensure this. The term is fundamental to web infrastructure and has no specific introduction, as it is inherent to the internet itself.
Availability sounds like a given, but it's the metric that trumps everything else in a crisis. A perfectly designed website that crashes for two hours once a month erodes trust more than a simple one that's always online.
Convert the advertising promises: 99 percent availability sounds excellent and means 3 days and 15 hours of downtime per year. 99,9 percent is 8 hours and 45 minutes. Only 99,99 percent brings the downtime down to under an hour. The difference between the first and third figures isn't a subtlety, but rather the difference between a single server and a failover-based infrastructure.
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