In one statement, Cloud computing is the delivery of on-demand IT resources over the internet. The companies that offer these computing services are called Cloud Service Providers (CSPs). CSPs charge users/organizations based on Cloud resources used through a variety of billing models. Cloud resources are the resources that are abstracted from the underlying physical hardware with the help of a Hypervisor. But there is a lot of confusion about Cloud computing because there are multiple types of services and deployment models that fall under the umbrella that is Cloud computing. This article will help you clear the basic concepts of Cloud computing.

Cloud Deployment Models
There are 4 types of Cloud deployment models:
Public Cloud
Private Cloud
Hybrid Cloud
Community Cloud
These deployment models differ on the basis of implementation type, hosting type and who has access to it. All Cloud deployment models are based on the same principle of Virtualization (abstraction of resources from bare metal hardware) but differ in terms of location, storage capacity, accessibility, and more. Depending on the type of data you are working with, you will want to compare Public, Private, Hybrid, and Community Clouds in terms of different levels of security they offer and the management required.

Public Cloud
The entire computing infrastructure is located on the premises of the CSP that offers Cloud services over the internet. This is the most economical option for those individuals/organizations that do not wish to invest in IT infrastructure. In a Public Cloud environment, the resources are shared between multiple users who are also called ‘Tenants’ The cost of using Cloud services is determined through the usage of IT resources consumed.

Private Cloud
Individuals/organizations that choose Private Cloud gets dedicated infrastructure that is not shared by any other individual/organization. The security and control level is highest while using a private network. The costs are born by an individual/organization and are not shared with any other individual/organization. Management of Private Cloud is taken care of by the user and the CSP does not provide any Cloud management services.

Hybrid Cloud
This Cloud deployment model includes the characteristics of Public Cloud and Private Cloud. Hybrid Cloud allows the sharing of data and applications between Public and Private Cloud environments. Organizations mainly use Hybrid Cloud when their On-Premise infrastructure needs more scalability, so they make use of scalability on Public Cloud to meet fluctuating business demands. Organizations can keep their sensitive data on their Private Cloud when reaping the power of the Public Cloud.

Community Cloud
A Community Cloud is a Cloud infrastructure that is shared by users of the same industry or by those who have common goals. This Cloud infrastructure is built after understanding the computing needs of a community as there are many factors including compliances and security policies which need to be included in the community Cloud infrastructure.

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