A common understanding of “cloud computing” is continuously evolving, and the terminology and concepts used to define it often need clarifying.
In cloud computing, the word cloud is used as a metaphor for “the Internet,” so the phrase cloud computing means “a type of Internet-based computing,” In the simple terms it means internet-computing or computing through internet. Cloud computing means storing and accessing data and programs over the Internet instead of ones computer’s hard drive.It is a kind of Internet-based computing that provides shared processing resources and data to computers and other devices on demand through internet. Example- When you store your photos online instead of on your home computer, or use webmail or a social networking site, you are using a “cloud computing” service.
Cloud Computing uses the internet and central remote servers to maintain data and applications. Cloud computing allows consumers and businesses to use applications without installation and access their personal files at any computer with internet access. This technology allows for much more efficient computing by centralizing data storage, processing and bandwidth.It is considered the evolution of a variety of technologies that have come together to change an organizations’ approach for building their IT infrastructure. Actually, there is nothing new in any of the technologies that are used in the cloud computing where most of these technologies have been known for ages. It is all about making them all accessible to the masses under the name of cloud computing. Cloud is not simply the latest term for the Internet, though the Internet is a necessary foundation for the cloud, the cloud is something more than the Internet. The cloud is where you go to use technology when you need it, for as long as you need it. You do not install anything on your desktop, and you do not pay for the technology when you are not using it.Cloud computing is therefore a type of computing that relies on sharing a pool of physical and/or virtual resources, rather than deploying local or personal hardware and software. It is somewhat synonymous with the term ‘utility computing’ as users are able to tap into a supply of computing resource rather than manage the equipment needed to generate it themselves.
There are different types of clouds that you can subscribe to depending on your needs. As a home user or small business owner, you will most likely use public cloud services.
1. Public Cloud – A public cloud can be accessed by any subscriber with an internet connection and access to the cloud space.
2. Private Cloud – A private cloud is established for a specific group or organization and limitsaccess to just that group.
3. Community Cloud – A community cloud is shared among two or more organizations that have similar cloud requirements.
4. Hybrid Cloud – A hybrid cloud is essentially a combination of at least two clouds, where the clouds included are a mixture of public, private, or community.
The main advantage of the cloud based computing is its flexibility and availability at low price .