Virtual Machine

 VIRTUAL  MACHINE

• A Virtual Machine (VM) is a resource that uses software instead of a physical computer to run a Program.
• One or more "guest" machines can run on a single "host" machine which is nothing but a physical computer.
• For example, If we are using windows 10 has a host machine we can run ubuntu ,kali ,lubuntu ,windows 8 ... any OS on the virtual machine.
• Multiple number of Operating System can be run at a single time.But this depend on the power or configrations of the host machine.
• There are various software available for running virtual machine.
• If you are familier with windows and also want to learn or use linux based OS,then Virtual machine is one of the best choice.
• Since in Virtual machine we can use both GUI and Command line features.
• Two popular virtual machine software for windows and linux OS are 
• VMware
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• Oracle VirtualBox
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• After installing ,we can download the intersted OS file and we can start using the OS as a guest in the host machine.
• In these Virtual machines,we can make configration based on our wish.

Five types of virtualization:

1. Hardware virtualization
2. Software virtualization
3. Storage virtualization
4. Network virtualization
5. Desktop virtualization

Advantages of Virtual Machine:

• Virtual machine allow us to use multiple OS in a single host.
• It saves physical space, time and management cost.
• It support legacy application. i.e., A linux OS can run on a non linux host(says Windows).
• It also provide integrated disaster recovery and application provision option.

Disadvantages of Virtual Machine:

• Running Multiple OS on a single physical machine can result in slow or unstable performance.
• Virtual machie are less efficient and slower than the OS running on a host machine.