Three cloud computing deployment models are :

• Cloud-Based Deployment
• On-Premises Deployment
• Hybrid Deployment

Cloud-Based Deployment

• Run all parts of the application in the cloud
• Migrate existing applications to the cloud
• Design and build new applications in the cloud

In a cloud-based deployment model, you can migrate existing applications to the cloud, or you can design and build new applications in the cloud. Those applications can be built on low-level infrastructure that requires IT staff to manage them. Alternatively, those applications can be built using higher-level services that reduce the management, architecting, and scaling requirements of the core infrastructure. For example, the company might create an application consisting of virtual servers, databases, and networking components that are fully based in the cloud.

On-Premises Deployment

• Deploy resources by using virtualization and resource management tools
• Increase resource utilization by using application management and virtualization technologies

On-premises deployment is also known as a private-cloud deployment. In this model, resources are deployed on premises by using virtualization and resource management tools. For example, the company might have application that run on technology that is fully kept in on-premises data center. Though this model is much like legacy IT infrastructure, its incorporation of application management and virtualization technologies helps to increase resource utilization.

Hybrid Deployment

• Connect cloud-based resources to on-premises infrastructure
• Integrate cloud-based resources with legacy IT applications

In a hybrid deployment, cloud-based resources are connected with on-premises infrastructure. This approach can be used in a number of situations. For example, company has legacy applications that are better maintained on premises, or company regulations require business to keep certain records on premises.

For example, suppose a company wants to use cloud services that can automate batch data processing and analytics. However, the company has several legacy applications that are more suitable on premises and will not be migrated to the cloud. With a hybrid deployment, the company will be able to keep the legacy applications on premises while benefiting from the data and analytics services that run in the cloud.