IaaS is an acronym for Infrastructure-as-a-Service. Cloud provides different services for us like Infrastructure as a service, Platform as a service, and Software as a service. If we want a whole server for ourselves, the cloud that provides the server. Here, we are getting infrastructure as a service.
IaaS provides VMs with virtual CPUs and virtual main memory which helps in computational power. Also, IaaS provides storage units, networking components, load balancers.
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You can watch this video on Cloud computing tutorial for beginners to get a quick start: