Cloud computing is a fast growing information technology trend that many companies including Google, Microsoft, and IBM are currently looking to get a stake in as demand for the service grows. Cloud computing is the concept of allowing both individuals and businesses to store data and applications on remote servers (owned and operated by a third party company), rather than on their own hard drives and data centers. The service boasts the ability to securely access data and applications from just about any device with an internet connection, allowing for such services as streaming music from a personal collection from multiple devices, and even to business
Cloud computing is one of the fastest growing segment of Information technology today. In simple words cloud computing means storing and accessing data and programs over the internet instead on the computer's hard drive which can be accessed from any part of the world if the individual are connected to the internet or a network connection is available 24/7. A simple example of cloud computing is g-mail. With the connection of internet through any medium we can send and receive emails.
According to Lawrence Shawa, "a number of organizations I have spoken to have expressed concern about how secure their data is that is hosted in the cloud. There is sense of control that is taken from them making the organizations feel vulnerable" (Collection 2:1) Companies naturally feel a strong sense of obligation to protect their customers. Additionally, they may lose business if they have a reputation for compromising customer security.
Modern cloud computing is a delivery system for computing services either for free, or on a pay-as-you-go basis. In this system, users utilize the Internet and remote data centers to run applications and store data. Cloud technology can allow more efficient computing by removing most of the upfront costs of setting up an IT infrastructure. It also allows organizations to expand or reduce their computing facilities very quickly. Increasingly, cloud computing is perceived as a big step toward the long-held dream of computing as a managed utility similar to cable TV or electricity.(Buyya et al, 2010) Cloud computing can be defined by certain criteria. These features are what make cloud computing an attractive option for modern organizations.
Cloud computing is the result of evolution and adoption of existing technologies and prototypes; although the origin of the term cloud computing is unclear. In the earliest stages, the term ‘cloud’ was used to represent the computing space between the provider and the end user. References to cloud computing in its modern sense appeared as early as 1996, with the earliest known mention in a Compaq internal document (Regalado, 2011). In 1997, Professor Ramnath Chellapa of Emory University and the University of South California defined cloud computing as the new “computing paradigm where the boundaries of computing will be determined by economic rationale rather than technical limits alone”. This has become the basis of what we refer to today when we discuss
People are utilizing cloud computing without having knowledge of it. Cloud computing is getting sophisticated with each passing day. Cloud computing is described by various organizations and IT professionals in different words. According to Almadallah,M, (2014, p.1) there is a fundamental program over the Internet, which is easily accessible to everyone, and gives an approach to users to progressing data, using services, running applications and updating software whenever and wherever they need.. This is known as “cloud computing.” Data with range and trustworthiness is being delivered over the Internet by cloud computing. According to Rajaraman,v(2014, p.242).People usecloud services as operating systems that run on personal computer and administered by special software. For example, Gmail, Yahoo mail, and Hotmail are provided by Google, yahoo and Microsoft and are used to send e-mail.
Cloud computing, or “the cloud”, is defined by NIST as; “...a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources (e.g., networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. This cloud model promotes availability and is composed of five essential characteristics, three service models, and four deployment models.” 
Cloud computing is the practice of using remote network servers via the Internet to manage, store and process data. Many businesses use cloud computing because in a lot of cases it can be cheaper, faster and easier to maintain then local servers. Since its introduction cloud computing has grown to not only be used by businesses but also regular Internet. Cloud computing services such as Google Docs, Dropbox and more are one of the reasons for this shift. They allow the user to access their files whenever and wherever they want.
The overall concept of cloud computing is one which is based on a new architectural model of computer resources which means the data is stored remotely, but is provided to users as if it was stored locally. This new concept has been described as being "a style of computing where massively scalable IT-enabled capabilities are delivered 'as a service' to external customers using internet technologies" ("Will IT of the Future Have Its Feet Firmly Planted in the "Cloud"?," 2008), in a dramatic shift from traditional computing methods. Cloud computing is also able to provide services to the end user seamlessly, to serve applications from a central location, regardless of the user’s location. There are numerous services such as
Cloud computing is a topic of which much is assumed. The average person recognizes the term “cloud computing” as having to do with their storage from their iPad or iPhone on the online storage area which syncs their Apple devices to their computer. This common cloud is called the iCloud. That is where common knowledge ends about this topic. However, upon further exploration, a deeper understanding is gained with greater explanation, and it is realized that cloud computing is something that is used all of the time on many levels of everyday technology. While the terminology remains cryptic to the mind of most people, the concepts behind the practical uses of cloud computing become quite clear. It is relatable and understandable. Upon this revelation, the iCloud is recognized as the tip of the preverbal iceberg when speaking about cloud computing. It is important to discuss and further understand the many types of cloud computing as well as the various applications to life through technology. This affects how information is stored online, computers are protected, information is secured, emails are processed, and many other factors that are taken for granted in the world of technology. Cloud computing is a general term used to describe how information is stored, utilized, and accessed over the internet. There is no cloud, but the word cloud gives the connotation of an abstract place which is known to exist but is too vast to touch or contain (Griffith,
Security is the most important thing for an organization or and company. If a company has a very big portal then we cannot say that the company is really very big but if the security of the company should be well assured that it is safe . Hence, I can say that Security is the most important hurdle for an organization to keep its data & policies undercover so that only the recommended people can have an access to it. With their business information and critical IT resources outside the firewall, customers worry about their vulnerability to attack.
To make it simple, cloud computing is a system for users store and access data or programs over the internet instead of individual hard drive. This cloud system is composed of three parts in terms of four important features, several service models and development models, details of those components will be explained in this report.
In common usage, the term “the cloud” is essentially a metaphor for the Internet. Marketers have further popularized the phrase “in the cloud” to refer to software, platforms and infrastructure that are sold “as a service”, i.e. remotely through the Internet. The major models of cloud computing service are known as software as a service, platform as a service, and infrastructure as a service. These cloud services may be offered in a public, private or hybrid network