Cloud computing is now one of the major metaphors for the Internet after Web 2.0 was deprecated. A cloud means the server, and when it is combined with computing, it means real-time computing on the server, scalability of infrastructure on the fly, adding a new infrastructure without changing the environment or without investing in new infrastructures, and training new personnel or licensing new software. Cloud computing encompasses a subscription-based pay per use service that in real time is capable of extending the existing capabilities.
Cloud computing comprises four service models:
Software as a Service (SaaS): In this type of environment, a single piece of software is delivered to a thousand clients through web browsers in a multi-tenant architecture. From a customer's point of view, this means no upfront investment in servers or software licensing. On the contrary, the provider also needs minimum investment as there is one more application to maintain with almost no additional...