Scalability turned hosting into a utility, because you could now dial usage up or down according to your needs. Instead of paying for lots of redundant machinery, you would now only pay for the disk space and CPU cycles you actually used. Scalability in cloud hosting gave companies the option to change the type and number of processors their workload demanded. Then restore the system to its original configuration once usage dropped back again.
https://www.esds.co.in/blog/what-is-...cloud-hosting/
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