"Okay," Noor said, exasperated. "I've Googled diagram of IaaS PaaS SaaS like five times today and they all look different."
Dino laughed. "Yeah, most of them are more confusing than helpful."
"Exactly! I just want one that actually makes sense."
"Alright," he said, grabbing a napkin. "Let’s sketch it out. Forget fancy graphics. I’ll explain it like a human."
The Mental Model: Who Manages What
"Imagine you're throwing a pizza party," Dino said. "There are three options."
Noor raised an eyebrow. "Pizza?"
"Stay with me. If you make the pizza at home from scratch, that’s IaaS. You get the ingredients and kitchen, but you do all the work."
"Okay."
"If you get a pre-made pizza base and toppings and just bake it, that’s PaaS. Someone helped prep. You still cook it."
"And SaaS?"
"You order delivery. Everything’s done. You just eat."
"That actually makes sense."
Actual Diagram of IaaS PaaS SaaS—Described Simply
"Here’s how it looks in tech terms," Dino said. "Let’s list components of a web app:"
Networking Storage Servers Virtualization OS Middleware Runtime Data Application
"In IaaS," he said, "the provider handles networking, storage, servers, virtualization. You manage everything else."
"So I set up the OS, install stuff, run the app."
"Exactly. Now PaaS—platform as a service—goes one level up. The provider handles OS, middleware, and runtime too."
"I just write code and push it."
"Right. SaaS? You do nothing. The provider handles it all—from hardware to the app."
"So Gmail is SaaS. I log in and use it. I don't even think about servers or runtime."
"Exactly. That’s the beauty—and the tradeoff."
Why Diagrams Help (When They're Done Right)
"Why is this so hard to visualize?"
"Because most diagrams don’t tell you who does what. They just stack boxes with no context."
A good diagram of IaaS PaaS SaaS should show responsibility—not just components.
"Think layers. Infrastructure. Platform. Application. Each layer adds abstraction. And reduces what you manage."
"So SaaS is the simplest to use but least flexible."
"Bingo."
When to Use Which
"So which one should I choose for a new project?"
"Depends," Dino replied. "If you need full control, go IaaS. If you want to build without managing infrastructure, go PaaS. If you just want to use a tool, go SaaS."
"So SaaS for email, PaaS for app dev, IaaS for deep customization."
"You’re getting it."
"And when in doubt, use a diagram of IaaS PaaS SaaS to explain it to your team."
"Exactly. If the diagram makes people nod instead of blink—it’s the right one."
Still Need a Visual?
Noor held up the napkin. "This should be online somewhere."
"We’ll clean it up and share it," Dino said. "Maybe with actual labels this time."
So they did. And for once, a diagram of IaaS PaaS SaaS helped someone understand, not just stare at colored boxes.
Because when the model clicks, the cloud doesn’t feel so cloudy anymore.