Unit IV: Virtualization — Overview

Virtualization is the cornerstone technology underpinning modern cloud computing. It enables multiple virtual instances of computing resources to run on a single physical host, dramatically improving efficiency, flexibility, and scalability. This unit explores virtualization from its foundational concepts to the specific hypervisor technologies that make cloud platforms possible.

What You Will Learn

In this unit, we examine:

• Introduction & Characteristics: What virtualization is, and the three core properties of virtualized environments.
• Taxonomy: The different axes along which virtualization can be categorized — execution, storage, and network.
• Virtualization & Cloud Computing: How virtualization capabilities map directly to cloud service characteristics.
• Pros & Cons: The real-world trade-offs of adopting virtualization at scale.
• VMware Deep Dive: A concrete example of full virtualization technology using VMware ESXi/vSphere.
• Hypervisors: Type-1 vs Type-2 hypervisors, full vs para vs partial virtualization.

Unit Roadmap

Why Virtualization Matters

Before virtualization became mainstream, a single application typically occupied an entire physical server — even if that server was only 10–15% utilized. Virtualization changed this paradigm entirely. By abstracting hardware resources, organizations can run dozens of workloads on a single machine, reduce capital expenditure, and deliver services on demand.

Cloud providers like AWS, Azure, and Google Cloud are built entirely on virtualization stacks. Understanding virtualization is therefore not optional for cloud practitioners — it is the foundation on which everything else rests.