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Virtualization is a technology that helps us to install different Operating Systems on a hardware. 
They are completely separated and independent from each other. In Wikipedia, you can find the 
definition as – “In computing, virtualization is a broad term that refers to the abstraction of computer 
resources.
Virtualization hides the physical characteristics of computing resources from their users, their 
applications or end users. This includes making a single physical resource (such as a server, an 
operating system, an application or a storage device) appear to function as multiple virtual 
resources. It can also include making multiple physical resources (such as storage devices or 
servers) appear as a single virtual resource...”
Virtualization is often −
•The creation of many virtual resources from one physical resource.
•The creation of one virtual resource from one or more physical resource.
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Types of Virtualization
Server Virtualization
It is virtualizing your server infrastructure where you do not have to use any more physical servers for different 
purposes.
Client & Desktop Virtualization
This is similar to server virtualization, but this time is on the user’s site where you virtualize their desktops. We 
change their desktops with thin clients and by utilizing the datacenter resources.
Services and Applications Virtualization
The virtualization technology isolates applications from the underlying operating system and from other applications, 
in order to increase compatibility and manageability. For example – Docker can be used for that purpose.
Network Virtualization
It is a part of virtualization infrastructure, which is used especially if you are going to visualize your servers. It helps 
you in creating multiple switching, Vlans, NAT-ing, etc.
Storage Virtualization
This is widely used in datacenters where you have a big storage and it helps you to create, delete, allocated storage 
to different hardware. This allocation is done through network connection. 
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Advantages of Virtualization Disadvantages of Virtualization

Using Virtualization for Efficient Hardware Utilization Extra Costs
Using Virtualization to Increase Availability Software Licensing
Disaster Recovery Learn the new Infrastructure
Save Energy
Deploying Servers too fast
Save Space in your Server Room or Datacenter
Testing and setting up Lab Environment
Shifting all your Local Infrastructure to Cloud in a day
Possibility to Divide Services
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There are several types of uses in virtualization, but the most commonly used are Server 
Virtualization and Client Desktops Virtualization. We have already discussed their advantages in the previous 
chapter and why are they used widely.
Virtualizing Desktop Computers
Client virtualization also called as VDI runs the entire desktop environment within a centralized server. All 
processing is done within the server. Client devices are typically thin clients that serve as an end node to connect 
I/O peripherals such as keyboard, mouse, a display, audio connectors and even USB ports over the LAN.
For example – Printer, Flash Drive, Web Cam, Card Reader, Smartphone, etc. Some thin clients include legacy 
serial and/or parallel ports to support older devices such as Receipt Printers,Time Clocks, etc. 
Setting up Test and Development Environments
One of the most powerful features of a virtualized environment is the possibility to create labs for different 
approaches in a minute, especially in software development and then to import the same infrastructure in 
production. Regarding the test environment, it brings cross-platform functionality to your dev-test environment and 
uses your preferred coding language to build natively. It tests your applications on the devices and platforms you 
use today: from Linux, Windows to iOS and Android.
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Virtualization vs. Cloud Computing
Although equally buzz-worthy technologies, virtualization and cloud computing are not 
interchangeable. Virtualization is software that makes computing environments independent of 
physical infrastructure, while cloud computing is a service that delivers shared computing 
resources (software and/or data) on demand via the Internet. As complementary solutions, 
organizations can begin by virtualizing their servers and then moving to cloud computing for even 
greater agility and self-service.
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Key Properties of Virtual Machines.
 
Partitioning
Run multiple operating systems on one physical machine.
Divide system resources between virtual machines.
Isolation
Provide fault and security isolation at the hardware level.
Preserve performance with advanced resource controls.
Encapsulation
Save the entire state of a virtual machine to files.
Move and copy virtual machines as easily as moving and copying files.
Hardware Independence
Provision or migrate any virtual machine to any physical server.
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