First from the beginning when mainframes were predicted to be the future of computing. Mainframes and large scale machines were built and used, and in some circumstances are used similarly today. The trend, however, turned from bigger and more expensive, to smaller and more affordable commodity PCs and servers.
Cloud computing refers to the many different types of services and applications being delivered in the internet cloud, and the fact that, in many cases, the devices used to access these services and applications do not require any special applications.
Essentially based on the concept of renting application functionality from a service provider rather than buying, installing and running software yourself.
End-user application is delivered as a service. Platform and infrastructure is abstracted, and can deployed and managed with less effort.
Platform as a Service (PaaS) . Platform as a service (PaaS), which is all about providing, a platform in the cloud, upon which applications can be developed and executed. Google, Salesforce.com (with Force.com), and Microsoft (with Azure) exist in this space. Facilities provided include things like database management, security, workflow management, application serving, and so on.
Also referred to as internal cloud or on-premise cloud, the cloud infrastructure that is managed and operated for one organization only, primarily to maintain a consistent level of control over security, privacy, and governance.
Essential characteristics of a private cloud typically include:
Also known as external cloud or multi-tenant cloud, this model essentially represents a cloud environment that is openly accessible. It generally provides an IT infrastructure in a third-party physical data center that can be utilized to deliver services without having to be concerned with the underlying technical complexities.
Essential characteristics of a public cloud typically include:
The Hybrid Cloud or an Intercloud is not as much a deployment model as it is a concept based on the aggregation of deployed clouds. Just like the Internet, which is a network of networks; intercloud refers to an inter-connected global cloud of clouds. Also like the World Wide Web, intercloud represents a massive collection of services that organizations can explore and consume.
Cloud computing is the next big wave in computing. It has many benefits, like better hardware management, since all the computers are the same and run the same hardware. It also provides for better and easier management of data security, since all the data is located on a central server, so administrators can control who has and doesn't have access to the files.
I hope you have learned a lot about cloud computing and the bright future it has in the coming years.