IaaS
Infrastructure as a Service — the provider supplies virtualized compute, storage, and networking while you manage the OS and up.
Infrastructure as a Service provides virtualized compute, storage, and networking, leaving the customer responsible for the operating system, middleware, runtime, and applications. AWS EC2 is the canonical example: AWS owns the physical servers and hypervisor, but the customer selects the AMI, patches the OS, configures security groups, and manages everything on the instance. IaaS sits at the bottom of the service-model stack, giving the most flexibility and the most operational burden. The exam “watch out”: moving from IaaS to PaaS (such as AWS Elastic Beanstalk) shifts OS-level patching to AWS.
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