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IaaS is one of three primary cloud service models, each offering a different level of abstraction and management:

Service Model	What You Manage	What the Provider Manages	Ideal For
IaaS (Infrastructure)	Applications, Data, Runtime, Middleware, OS	Virtualization, Servers, Storage, Networking	IT teams needing full control over the OS and software stack; "lift-and-shift" migrations.
PaaS (Platform)	Applications, Data	Runtime, Middleware, OS, Virtualization, Servers, Storage, Networking	Developers wanting to focus solely on code without managing the underlying platform.
SaaS (Software)	(Nothing - just use the app)	Applications, Data, Runtime, Middleware, OS, Virtualization, Servers, Storage, Networking	End-users needing access to ready-to-use software like email or CRM.

Analogy: If IT infrastructure were pizza:

On-Premises: You make the pizza at home from scratch—buying ingredients, owning the oven, and doing all the work.‍
IaaS: You get a pizza delivery kit with pre-made dough and toppings. You use your own oven and assemble it yourself (you control the "cooking" environment).‍
PaaS: You order a fully-assembled, uncooked pizza and bake it in your own oven (you control when it's "run").‍
SaaS: You order a hot, delivered pizza and just eat it (you just consume the end product).