Much of information is already available to the organizations about the uses and characteristics of cloud computing. What most of us need to know are the various service models available in this noble technology. Primarily they can be categorized under three model heads namely Infrastructure as a service, Platform as a service and Software as a service abbreviated as IaaS, PaaS and SaaS. All three cater to different business requirements. The cloud clients include web browser, the mobile app industry, thin client based networks, terminal emulators and many more.

The IaaS provides the basic infrastructural service to the clients. This way the client is required to worry less or not at all about the relevant basic IT resources. The service provider maintains the infrastructure which includes keeping it powered all the while, cooling and further acquisition of hardware. This is akin to renting a hotel room where we are more interested in the services than the source of them. The infrastructure includes virtual machines, servers of different capacities, load balancers and other resources pertaining to IT networking.

PaaS is a notch higher than that of IaaS. They offer the platform for development of new software, execution of the programmes, database management etc. along with web server. This further facilitates the clients to save the resources otherwise required for the software layers and the consequent hardware. This model also optimizes the use of storage facilities wherein the system automatically allocates the unused space scaling up the efficiency. The SaaS model majorly consists of the database, development tools, the execution runtime and the web servers.

The third variant is the SaaS making use of the software as an access for the client. The service providers install the applications and software interfaces on the cloud client and manage the rest on their part. The service user is saved from the pain of installation and management on a whole. The user organization is provided access through the cloud client's systems. This model makes the maximum use of virtual network of systems. The cloud computing on its part makes the cloud client a multitenant providing different access points to many users while one user finds only a single point of entry to the system. The pricing is done accordingly which is normally the procedure of pay-per-usage. The providers bill the customer owing to the use of the applications through the subscription fees. Further, through load balancing, the functions are distributed to the network of virtual clients. This model is used majorly by the Customer Relation Management organizations, communications and the gaming industry etc.

As of now, these three cloud hosting models are required by business establishments owing to their specific needs. Look out ahead for the different types of clouds so that it could be easier for anybody to pen the final decision.