Explain Private, Public, Community and Hybrid Cloud in Cloud Deployment Model in details

Four Cloud Deployment Models

i) Private Cloud

• The cloud infrastructure is provisioned for exclusive use by a single organization comprising multiple consumers (e.g., business units). 

• It may be owned, managed, and operated by the organization, a third party, or some combination of them, and it may exist on or off premises.

• Companies that look for cost efficiency and greater control over data & resources will find the private cloud a more suitable choice.

• It means that it will be integrated with your data centre and managed by your IT team.

• Alternatively, you can also choose to host it externally. The private cloud offers bigger opportunities that help meet specific organizations requirements when it comes to customization. 

• It's also a wise choice for mission-critical processes that may have frequently changing requirements. 

ii) Public Cloud

• The cloud infrastructure is provisioned for open use by the general public.

It may be owned, managed, and operated by a business, academic, or government organization, or some combination of them.

• It also makes a great choice for companies with low-security concerns.

• Thus, you pay a cloud service provider for networking services, compute virtualization & storage available on the public internet. 

• It is also a great delivery model for the teams with development and testing. Its configuration and deployment are quick and easy, making it an ideal choice for test environments.

• Most common uses of public clouds are for application development and testing, non-mission-critical tasks such as file-sharing, and e-mail service. 

iii) Community Cloud

• The cloud infrastructure is shared by several organizations and supports a specific community that has shared concerns (e.g., mission, security requirements, policy, and compliance considerations).

• It operates in a way that is similar to the public cloud. There's just one difference - it allows access to only a specific set of users who share common objectives and use cases. 

• This type of deployment model of cloud computing is managed and hosted internally or by a third-party vendor. However, you can also choose a combination of all three.

• This deployment model supports multiple organizations sharing computing resources that are part of a community.

• For examples include universities cooperating in certain areas of research, or police departments within a county or state sharing computing resources. Access to a community cloud environment is typically restricted to the members of the community. 

iv) Hybrid Cloud

• The cloud infrastructure is a composition of two or more distinct cloud infrastructures (private, community, or public) that remain unique entities but are bound together by standardized or proprietary technology that enables data and application portability (e.g., cloud bursting for load balancing between clouds).

• While each model in the hybrid cloud functions differently, it is all part of the same architecture. Further, as part of this deployment of the cloud computing model, the internal or external providers can offer resources.

• Many organizations make use of this model when they need to scale up their IT infrastructure rapidly, such as when leveraging public clouds to supplement the capacity available within a private cloud.

• A company with critical data will prefer storing on a private cloud, while less sensitive data can be stored on a public cloud. The hybrid cloud is also frequently used for 'cloud bursting'. It means, supposes an organization runs an application on-premises, but due to heavy load, it can burst into the public cloud.

• For example, if an online retailer needs more computing resources to run its Web applications during the holiday season it may attain those resources via public clouds.