There are tons of little applications that run in the background on all OSes. Services on Windows, daemons on Unix/macOS. This is true for phones and tablets, too, as those run a variant of Unix as well (iOS/iPadOS/AndroidOS). Restarting the computer or device will make sure all of those background apps restart, too.
This is why I tell my wife to restart her phone when she stops getting new mail. She’ll go literally months between restarts and something’s bound to stop responding or get hung.
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