1.Public cloud
Public cloud are the most common of deploying cloud computing.The cloud resources (like servers and storage) are owned and operated by a third party cloud service provider and delivered over the internet.Microsoft Azure is an example of a public cloud.With a public cloud,all hardware,software and other supporting infrastructure is owned and managed by the cloud provider. In a public cloud,you share the same hardware,storage and network devices with other organizations of cloud "tenants". You access services and manage your account using a web browser.Public cloud deployments are frequently used to provide web browser.Public cloud deployments are frequently used to provide web-based email,online office applications storage and testing and development environments.
Advantages:
a.Lower costs.
b.No maintenance
c.Near unlimited scalability.
d.High reliability
2.Private Cloud
A private cloud consists of computing resources used exclusively by one business on organization.The private cloud can be physically located at your organization's on site data center or it can be hosted by a third party service providers .But in a private cloud,the services and infrastructures are always maintained on a private network and the hardware and software are dedicated solely to your organization.In this way,a private cloud can make it easier for an organization to customize it's resources to meet specific IT requirements.Private clouds are often used by government agencies,financial institutions and other mid-to large size organizations with business critical operations with business critical operations seeking enhanced control over the environment.
3.Hybrid Cloud
Hybrid clouds combine on premises infrastructure or private clouds with public clouds so organizations can reap the advantages of both.In a hybrid cloud,data and applications can move between private and public clouds for greater flexibility more deployment options.For instance,you can use the public cloud for high-volume,lower security needs such as web based email and the private cloud for sensitive,business-critical operations such as financial reporting. In a hybrid cloud,"cloud bursting" is also an option.This is when application or resource runs in the private cloud until there is a spike in demand during an event like seasonal shopping or tax filing , at which point an organization can "burst through" to the public clod to tap into additional computing resources.
Advantages:
a.Control - Your organization can maintain a private infrastructure for sensitive assets.
b.Flexibility - You can take advantage of additional resources in the public cloud if you need them.
c.Cost effectiveness - With the ability to scale to the public cloud,you pay for extra computing power only when needed.
d.Ease - Transitioning to the cloud doesn't have to be overwhelming because you can migrate gradually phasing in workloads
4.Community cloud
The cloud infrastructure is provisioned for exclusive use by a specific community of consumers from organizations that have shared concerns (e.g mission,security requirements policy and compliance considerations). It may be owned,managed and operated by one or more of the organization,a third party or some combination of them and it may exist on/off premises.
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