Day-4 | Virtual Machines Part-1 | Free DevOps Course | 45 days

Welcome to Day-4 of the DevOps Zero to Hero Series!
In this session, we break down one of the most important fundamentals in DevOps and Cloud—Virtual Machines (VMs).

This video focuses on building a deep conceptual understanding of VMs before touching any tools or AWS services.

✔ Why Virtual Machines Exist (Real-World Analogy)

Understand resource wastage using the “1-acre land” example

Learn how organizations waste hardware when using physical servers

See how virtualization solves this inefficiency

✔ Physical Server Problems

Companies buy huge servers (100GB RAM, 100 CPUs)

Applications use only 5%–10% of those resources

90% of server capacity gets wasted

Cost, space, and hardware inefficiency becomes a major issue

✔ What Virtual Machines Actually Are

VMs are logical computers, not physical ones

Completely isolated with dedicated CPU & Memory

Multiple VMs run on a single physical server

No VM can interfere with another

✔ Hypervisor Explained Simply

The software layer that makes virtualization possible

Installed on the bare metal to create & manage VMs

Examples: VMware, Xen, VirtualBox

Helps divide one big server into many small virtual servers

✔ How Cloud Providers Use VMs Internally

Inside AWS, Azure, GCP data centers

Millions of physical servers run Hypervisors

Your VM request (like EC2) becomes a “slice” inside a physical machine

You get access to the VM’s IP, OS, and login credentials

✔ What’s Coming Next?

In the next class (Day-5), we will go hands-on to understand:

How to create VMs manually on AWS & Azure

Why UI-based creation is slow

How DevOps engineers automate VM creation using APIs, CLI & IaC tools