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When talking about cloud, we actually talk about one of three types of cloud, and it's important to

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know the differences between the three types of cloud that we have.

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And the three types are public cloud, private cloud and hybrid cloud.

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And let's begin with public cloud.

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So the public cloud is a cloud that is set up in the public network.

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It is managed by large companies such as Microsoft, Amazon, Google and so on.

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It is accessible through the Internet.

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So we do not need a specialized internal network to access the cloud.

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It is also available to all clients and users and not only users of a specific organization, and the

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clients have no access to the underlying infrastructure.

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This is similar to what we discussed before in the previous lecture when we said that either with us

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or us, we don't have access to the underlying infrastructure of the cloud.

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We can only use resources that are built on this infrastructure.

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So this is a public cloud.

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The most popular public clouds are aways of Amazon, Azure of Microsoft, Google Cloud and IBM cloud.

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Of course, there are a lot more public cloud such as Oracle, Cloud, Alley, Cloud and so on.

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So this is the public cloud.

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Next is private cloud.

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Private cloud is a cloud set up in an organization's premises.

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It is managed by the organizations Atim and is accessible only in the organizations network.

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So naturally it's available only to users from the organizations.

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Other users, other external users that are not members of this organization do not have access to this

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cloud.

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This cloud uses private cloud infrastructure and engines, and it usually contains only a subset of

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the public cloud capabilities.

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Organizations usually use private cloud for security reasons because they want the resources and data

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to be stored inside the organization premises and they do not want them to be exposed in the public

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cloud.

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So some examples of private cloud are VMware cloud, RedHat, open shift and as you stack next is a

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hybrid cloud.

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So a hybrid cloud is a cloud that is set up in an organization's premises, but it is also connected

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to the public cloud.

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That means that workloads can be separated between the two cloud, for example, sensitive data in the

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organization's premises and public data in the public cloud.

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So, for example, the organization can decide that the usernames and passwords and perhaps even the

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credit codes of its users will be stored inside the organization's premises.

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But for example, the professional profile of its users, such as the ones in LinkedIn, will be stored

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in the public cloud.

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Now, usually hybrid cloud are managed by the public cloud, which is connected to the private cloud.

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But this is not always the case.

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And sometimes you can see the other way around so that the private cloud controls and manages the resources

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in the public cloud.

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So some examples for hybrid cloud are azure oak and A.W. outposts both extend the public cloud into

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the organization's premises and manage and control these private cloud from the public cloud.

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So these are the three types of cloud we have the public, the private and the hybrid.

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In the viscose, we are going to discuss only the public cloud.

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This is the most important type of cloud and this is the main focus of the industry right now.