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So we talked about cloud services, and in order to better understand what other types of cloud services,

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let's take a look at the three most common types.

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And these types are Ayas, Pass and suss.

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And let let's see what exactly are they.

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And let's begin with us.

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So I stand for infrastructure as a service.

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And what it means is that the cloud provides the underlying platform, such as compute networking and

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storage, and then the client is responsible for all the rest.

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In other words, the cloud provides the absolute minimum infrastructure and we the cloud of the cloud

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are expected to take care of all the rest.

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The most common example of us is virtual machines with virtual machines.

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The cloud provides the host machine, the networking and the disks, and the client creates the virtual

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machine or the guest machine and then installs software on it, patches it, maintains it, etc..

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So it is the responsibility of the client to make sure that it's a virtual machine is up and running

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and the cloud has nothing to do with it.

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So this is its next one is Buzz.

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Buzz is platform as a service and with the services, the cloud provides a platform for running apps.

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That means that the cloud provides the compute, networking, storage, runtime environment, scaling

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redundancy, security updates, patching, maintenance, etc. and the client just needs to bring the

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code to run.

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So our responsibility as a client of the cloud is to develop our software and then upload it to the

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cloud and the cloud takes care of all the rest.

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The most common example of POS are, of course, Web apps with Web apps.

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The cloud provides the runtime for running the rebuffs and the client only uploads the code and then

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it just runs.

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Now, what's important to note with Path is that the client has no access to the underlying virtual

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machines.

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While with us we can and should actually access the virtual machine and make sure that everything is

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fine with us.

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We simply don't have access to this.

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It is the responsibility of the cloud to make sure the application is up and running and the last type

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of services is sus.

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Sus stands for software as a service and what it means is that it is software running completely in

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the cloud, the user or us.

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In this case, we do not need to install anything on premises or on the machine.

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The provider of the software takes care of updates, patches, redundancy, scalability, etc. We can

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only use software, but we can't and shouldn't mess with the underlying infrastructure of it.

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So the most common examples of SaaS are software such as Office 365 and Salesforce, which are installed

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in the cloud, and we as users just use it.

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We have no idea what is the infrastructure that Office 365 and Salesforce are running on.

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What are the virtual machines, what language are they developed in, what is a database and so on.

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We just use it.

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So to summarize the three types of services, take a look at this chart.

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So this chart depicts the level of control we need to have on each type of resource with each type of

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service.

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So if you will start from the left, we see that on on premises resources.

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We take control of everything.

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So if you will take a look from the bottom up, we see we are responsible for the networking, the storage,

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the server, the virtualization, the operating system, middleware runtime data and applications.

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We take control of everything which is just natural.

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These resources run on our premises.

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So of course we need to take control of everything.

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Next is the infrastructure as a service.

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And with us we see that the cloud takes control of the networking storage servers and virtualization,

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and we control everything that's above it, which is in this case, the operating system, the middle

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of the runtime data and applications.

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In other words, the virtual machine.

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With the platform as a service, we control the data and the applications, the cloud controls all the

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rest.

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So we takes control on virtualization, for example, on the middleware or the runtime, which is very

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important with platform as a service or with web apps and so on, and with software as a service.

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We control nothing.

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We just use the application, but we have no access to the underlying infrastructure.

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So as you can see, the cloud controls everything with software as a service.

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Now actually there are additional service types, such as fast functions as a service DB ACE database

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as a service doeth, which is desktop as a service iota's, which is Iot as a service, and even A.I.S,

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which is a service.

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But still the most common terms are Ayas Path and OS, and we will use it quite a lot throughout this

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course.