🌐 The Big Picture First Think of cloud service models as a spectrum of responsibility . The more you move right, the less you manage — but also the less control you have. YOUR RESPONSIBILITY ◄────────────────────────────────────────────► Maximum Minimum On-Premises → IaaS → PaaS → SaaS → Serverless Enter fullscreen mode Exit fullscreen mode A useful analogy is pizza : On-Premises = Make pizza at home (you own everything) IaaS = Order dough & ingredients (you cook it) PaaS = Order pizza kit (just assemble & bake) SaaS = Order delivery (just eat it) Enter fullscreen mode Exit fullscreen mode 🏗️ Layer 1 — IaaS (Infrastructure as a Service) What it is You rent raw infrastructure — servers, storage, networking — from a cloud provider. The provider manages the physical hardware. You manage everything above the hypervisor.…