Public Cloud Model
The Public Cloud allows systems and services to be easily accessible to general public, e.g., Google, Amazon, Microsoft offers cloud services via Internet.
There are many benefits of deploying cloud as public cloud model. The following diagram shows some of those benefits:
Since public cloud share same resources with large number of consumer, it has low cost.
Since public cloud employs large number of resources from different locations, if any of the resource fail, public cloud can employ another one.
It is also very easy to integrate public cloud with private cloud, hence gives consumers a flexible approach.
Since, public cloud services are delivered through Internet, therefore ensures location independence.
Utility Style Costing
Public cloud is also based on pay-per-use model and resources are accessible whenever consumer needs it.
Cloud resources are made available on demand from a pool of resources, i.e., they can be scaled up or down according the requirement.
Here are the disadvantages of public cloud model:
In public cloud model, data is hosted off-site and resources are shared publicly, therefore does not ensure higher level of security.
It is comparatively less customizable than private cloud.