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- Let's talk about the
Amazon Machine Image.

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So an Amazon Machine Image is
where all EC2 instances start.

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An Amazon Machine Image is essentially

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a bit-for-bit copy of the root volume.

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In this particular example the root volume

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could be an EBS volume, an
Elastic Block Store volume,

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or it could be an instance store

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and we're gonna talk about

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what exactly that means coming up,

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but on that root device we
have our operating system,

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we have whatever
applications were installed,

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we have users and groups and we have

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however things are configured
so on and so forth.

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If we then create an image from that,

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that bit-for-bit copy will
contain the operating system,

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the applications and
all the configurations.

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From there, these Amazon
Machine Images are stored in S3,

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but they're stored in sort
of like this admin zone

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that we don't have direct access to.

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We don't really have direct
access to the raw data

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that makes up the Amazon Machine Image,

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but we do know that those
machine images are stored in S3

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and we'll talk more about
why that's important later

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when we cover storage.

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From that image, that will allow us

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to launch clones of the original machine.

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So if we install, let's say
we install Linux and Apache

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and our application on this machine

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and then we want to clone that,

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we would first create the machine image

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and then use that image
to launch an exact copy

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of that machine over and over again.

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We could launch one clone,
we could launch 1,000 clones.

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That would be up to us,

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but whatever machines are
launched from that machine image

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will all come out exactly the same.

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So again Amazon Machine Images

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are where all EC2 instances start.

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They are a bit-for-bit
copy of the root volume

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and when you clone those machines,

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they will all have the same OS,

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the same applications installed

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and will all be configured
in the same way.