The latest buzz in the IT world that has reduced the distance between a user and the locations of his resources and data is cloud computing, which is also called as Software as a Service (SaaS).
With Cloud Computing he or she can access applications of cloud using web browser from anywhere at any time. On the other hand, servers of cloud store large amount of data, with which time and distance will never be a major criterion for web users.
Many thanks to Cloud Computing for offering diverse services that made many of the actions to be possible and that too very effectively. Delivering of computing resources over the web is the major service provided by Cloud Computing. Though there are an umpteen number of services by Cloud Computing company, three basic models that are widely used are:
IAAS: Infrastructure as a Service
SAAS: Software as a Service
PAAS: Platform as a Service
The aforesaid models define the foundation of a web hosting service by providing the necessary components required.
IAAS (Infrastructure as a service) provides IT professionals control over the basic infrastructural needs like storage, memory, CPUs, virtual machines and more, those are crucial to access a website or stored data.
On the other hand, SAAS (Software as a Service) which is also referred to as on-demand software helps in eradicating the need to install full-fledge software and access it directly through the clouds. It is one of the easiest cloud model to set up and manage. Popular SaaS products like Office365, Google Apps, TurboTax Online, Dropbox, and Salesforce are being used by thousands of businesses on daily basis.
Platform as a Service (PaaS) provides pre-defined software environment such as operating system, programming language execution environment, database and the web server to set up and run the applications effectively. Over wholly, it offers the platform to take full control over the apps installed and no control over the underlying hardware or OS. Few of its examples include web servers, database servers including SQL, or programming environments that support Java, .NET, or Python.