Public Cloud
Public cloud allows the accessibility of systems and services easily to general public. Eg: Amazon, IBM, Microsoft, Google, Rackspace etc.
Advantages of Public Cloud Model
1) Low Cost
Public cloud is having low cost as compared to private or hybrid cloud, because it shares same resources with large number of consumer.
2) Reliable
Public cloud provides large number of resources from different locations, if any of the resource fail, public cloud can employ another one.