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All right, let's start discussion about differences of virtual machines and Docker containers from

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talking about architecture of virtual machine.

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And let me first explain you this diagram, and afterwards I'll show you how I personally use virtual

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machines.

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All right.

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So if you want to create a virtual machine, you should have either physical server or virtual server.

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It is basically possible to create virtual machines inside of other virtual machines.

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And there is host operating system host operating systems could be different, for example, either

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macOS, Windows or Linux, any operating system afterwards.

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On top of this host operating system, you should install so-called hypervisor.

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Examples of such hypervisors are following VirtualBox.

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It is free and open source VMware Fusion, for example, that is used on Mac OS or VMware ESXi and VMware

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ESXi is basically installed directly on the computer.

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It doesn't require any other host operating system.

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It means that there could be scenarios when hypervisor is running directly on physical server or other

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virtual server.

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All right.

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On top of hypervisor, you are able to create virtual machines.

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And notice that main key idea here is that every virtual machine has its own guest operating system.

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And that means that you are able to create different virtual machines with different guest operating

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systems on another physical computer that is running different operating system.

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For example, host Operating system could be Windows guest here could be Linux, guest OS here, could

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be macOS.

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And every virtual machine has of course its own set of binary files, executables, own file system,

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actually dedicated resources like CPU memory, hard disk and so on.

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And of course inside of every virtual machine you are able to run applications and every application

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inside of every virtual machine will be, of course isolated from applications in other virtual machines.

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We could say that every virtual machine is separate world, separate entity.

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And that means that if you want to get complete separation of computers, virtual computers, you could

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of course use virtual machines and you should use virtual machines.

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All right.

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Let me now demonstrate you how I personally use virtual machines.

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Basically, this computer that you see right now, it is macOS computer.

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It is actually virtual machine.

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And this virtual machine is running using VMware fusion hypervisor.

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Also on this computer.

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Basically my main computer is macOS Computer with 16GB of Ram.

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I also run other virtual machines on the same computer.

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And here, for example, you may see Ubuntu virtual machine here you could see Windows Virtual Machine.

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And again, all those three virtual machines are currently running on single physical macOS computer.

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Let me quickly demonstrate you how actually this looks like in terms of VMware Fusion and how actually

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resources are splitted across different virtual machines.

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But let me do that after the small pause.

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See you next.

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Bye bye.