On a very basic level, a server is a computer with an operating system like you use at home. They get updates that require it be restarted so this could be it.
They may also be upgrading software or services on the server that require nobody to be accessing it at the time
Bigger businesses usually have multiple servers using losd balancing and other technologies so that if one goes offline, the other is still functional so the user doesn’t see any downtime
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