They don’t always! It depends what was updated.
When you turn on a computer, it has to go through A LOT of steps to get everything ready. One of those steps is to load all the software it needs into memory. A lot of this software is ONLY loaded into memory at this stage, because, for example, it might do something like control delicate/complicated hardware, and reloading or unloading it from memory, even temporarily, could cause it to malfunction.
So if you update software, then how to you activate the updated version? You have to do the thing that causes it to be loaded into memory. If it’s a piece of software that is only loaded when you turn on the computer, that’s what you have to do.
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