The period of time during which a computer system, server, or service is operational and available for use.
Compound word from "up" (functioning, operational) + "time", emerging in computer and telecommunications contexts in the 1960s-70s as system reliability became crucial for business operations. Contrasts with "downtime" when systems are non-functional.
Uptime has become a critical business metric in our digital age, with companies promising "five nines" (99.999%) uptime, meaning only about 5 minutes of downtime per year. This term reflects our society's growing dependence on always-available digital services and the enormous economic impact when systems fail.
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