Private Cloud :
Private cloud is cloud infrastructure operated solely for a single organization, whether managed internally or by a third-party, and hosted either internally or externally. Private cloud is the phrase used to describe a cloud computing platform that is implemented within the corporate firewall, under the control of the IT department.Deploy the virtualization solution of your choice on top of our bare metal servers (New or Old) installed in the cusotmers dedicated servers. You keep complete control, and you can integrate at will with your on-premises and off-premises bare metal and virtual servers.A private cloud removes a number of objections to the cloud computing model including control over enterprise and customer data, worries about security, and issues connected to regulatory compliance.
Brand: IBM, HP, Cisco, Vmware, MS, Red Hat etc.
Public Cloud :
A cloud is called a "public cloud" when the services are rendered over a network that is open for public use.In Public cloud computing company relies on a third-party cloud service provider for services such as servers, data storage, firewall, and applications, which are delivered to the company through the Internet. A public cloud can free companies from the potentially expensive costs of having to purchase, manage and maintain on-premises hardware and software infrastructure.
Public clouds can also typically be deployed much faster and with more scalability and accessibility than on-premises infrastructure (Private Cloud) as a result of the public cloud provider’s expertise and existing infrastructure. It also reduces technical resource cost for the company. Public cloud subscribers may pay pay-as-you-go fees or fixed monthly fees for the public cloud services they utilize.
Brand: Softlayer, Netmagic, Azure
Hybrid Cloud :
Hybrid cloud is a composition of two or more clouds (private, community or public) that remain distinct entities but are bound together, offering the benefits of multiple deployment models. Hybrid cloud can also mean the ability to connect collocation, managed and/or dedicated services with cloud resources.Varied use cases for hybrid cloud composition exist. For example, an organization may store sensitive client data in house on a private cloud application, but interconnect that application to a business intelligence application provided on a public cloud as a software service. This helps the enterprise to deliver a specific business service through the addition of externally available public cloud services. Alternatively, an Infrastructure as a Service (IaaS) offering, for example, could follow the hybrid cloud model and provide a financial business with storage for client data within a private cloud, but then allow collaboration on project planning documents in the public cloud - where they can be accessed by multiple users from any convenient location.