Public cloud provides a wide spectrum of services. From Infrastructure-as-a-Service (IaaS), Platform (PaaS), through to Software-as-a-Service (SaaS). SaaS is likely the most familiar, since the vast majority of organizations have consumed a SaaS application in one form or another. While traditional hosting services have evolved away from bare metal to form IaaS, and generally up the stack to PaaS, including security as part of the service will change as security gets baked-in closer to the infrastructure.
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