1.1. What Is Cloud Computing?

💡 First Principle: Cloud computing turns compute, storage, and networking into resources you rent by the minute instead of hardware you own outright — which shifts the core risk from "did we buy enough capacity" to "are we only paying for what we're using right now."

Before cloud computing, a company's ability to grow was gated by procurement cycles. Bad capacity planning meant either idle, depreciating hardware sitting in a data center, or a product launch that crashed because nobody guessed correctly how many servers a viral feature would need. Cloud computing turns that guess into a real-time dial you can turn up or down — and turning that dial correctly, for the right service, in the right scenario, is most of what this exam tests.

Think of it like the difference between owning a car and using a ride-hailing app. Owning a car means paying for insurance, maintenance, and depreciation whether you drive it or not. A ride-hailing app means paying only for the trips you actually take — with the tradeoff that you don't control the exact vehicle you get every time.

⚠️ Common Misconception: "Cloud computing is just someone else's data center" undersells what's actually being purchased. In reality, you're not renting server space — you're renting a managed abstraction over compute, storage, and networking, with Google handling everything below the layer you're paying for. Exactly how much Google manages for you is what the next subsection is about.