A scheduled period when systems can be taken offline for updates, repairs, or improvements with minimal business impact. It's typically planned during low-usage hours.
From Old French 'maintenir' (to hold in the hand, maintain) and Old Norse 'vindauga' (wind eye, window). The compound term emerged in IT operations in the 1980s.
Maintenance windows are like dental appointments for your software - nobody wants them, but they prevent much bigger problems later. Smart companies schedule them when their users are asleep, which is why you often see 'scheduled maintenance' notices at 2 AM!
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