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What exactly is vertical scalability?

Hi. As regards the area of multi-tier architecture and scalability, what does vertical scaling mean? I read definitions such as 'Vertical scaling - services are scaled within the system', but this makes no sense to me.

I can see the sense in horizontal scaling, because it happens within the same tier and flexible replication can take place. But form what I read about vertical scaling I don't understand the benefits, nor really what happens
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8/22/2022 - Mon