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Microsoft Azure Fundamentals

IaaS vs PaaS vs SaaS

Three categories of cloud computing

Infrastructure as a service (IaaS)

Common IaaS use cases

Platform as a service (PaaS)

Common PaaS use cases

Development framework
Analytics or business intelligence

Software as a service (SaaS)

Cost and Ownership

Β  IaaS PaaS SaaS
Upfront costs None, pay for what you use None, pay for what you use None, monthly / annual subscription
User ownership purchase, installation, configuration, and management of their own software, operating systems, middleware, and applications development of their own applications not responsible for any maintenance or management of that software.
Cloud provider ownership underlying cloud infrastructure (such as virtual machines, storage, and networking) is available for the user. operating system management, network, and service configuration.. typically everything except user application provision, management, and maintenance of the application software

Management responsibilities

shared responsibility model