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There are three models of providing Cloud Computing services via the Internet, indicating the deliveries of resources depending on the receiver’s needs for software, platform or infrastructure. The Cloud services decrease the IT costs, provide access to the latest technologies and enable scalability according to current requirements. The Cloud Computing models are divided into three categories: SAAS (Software as a Service), IAAS (Infrastructure as a Service) i PAAS (Platform as a Service).


What is the SaaS (Software as a Service)?


It is a service of providing users with the necessary software functions via Internet by a provider or authorized partner. Clients have access to functional tools they need, not necessarily unified by seamless interface.

All programs are operating from the provider’s Server. Clients pay for each use of the service and get an on-demand access to it. The SaaS applications are also called net software, on-demand software or host software. SaaS is the fastest growing technology branch. Because most of clients’ attention focuses on low entering costs, and for the provider on incomes for subscription fees, SaaS is getting more and more popular. SaaS operates on IaaS. and PaaS.


What does SaaS include?


SaaS includes specific functional applications like CRM, accounting applications, human resources managing applications, etc. licensed and provided on-line on demand or in the cloud computing environment.


What is necessary to use SaaS?


Connection to Internet.


What are the advantages of SaaS?


1. Lower costs. The SaaS applications base on subscriptions so there are no license fees. As it is the provider who manages the entire IT infrastructure, clients do not bear the costs of hardware, software and the IT employees.

2. Easy to use. The SaaS applications are available from every computer or any other net connected device. The ease of usage stem from the fact that the only condition to be able to use the service is the ability to use the internet.

3. No upgrades. As it is the provider who does the upgrades and updates,users do not have to worry about installing current versions of applications. It is also the provider who manages the availability so clients do not have to concern about neither additional hardware nor software or any other issues when they need to add in-house users.

4. Easy integration. A provider who have an extended infrastructure can constantly scale to fulfill client’s demands. Many providers can tailor the service to the individual needs of users, and deliver interface for SaaS to perform with business productivity programs within company, for example the CMS.


What is the IaaS (Infrastructure as a Service)?


It is a fully outsourced service of providing IT infrastructure as a distinct from a self-owned preliminary infrastructure capital investing model. IaaS operates with SaaS and PaaS.

Instead of purchasing servers, software licenses, place for data center, network equipment, taking care of securities, backups, and self-owned infrastructure functions availability, clients pay their IaaS provider for the service and it is his job to keep it work properly.


What are the attributes of IaaS’s?


It is a tool program service, enhancing administrative tasks automatization. The main features of the IaaS are: dynamic scaling, interface virtualization and via internet use.


What is necessary to use IaaS?


Connection to Internet.


What are the advantages of IaaS?


1. Lower capital and personal costs. By reducing the self-owned infrastructure, the corporation reduces both the capital costs and the costs of IT staff keeping the resources.

2. Fees depending on intensiveness of usage. Instead of buying infrastructure which may remain unused for months or years or be just occasionally used, clients can purchase exactly the kind of infrastructure they need the very moment. This feature of the IaaS enables users to pay only for what is really necessary for them.

3. Dynamic scaling. The IaaS users benefit form scaling in a few aspects regarding the environment in real time in accordance to the changes taking place in their corporations. Responding to client’s needs provider can gradually extend the initial capacity of his server depending on the growth of his business or seasons.

4. Easy access to the modest IT technologies. The IaaS users have access to the highest level IT infrastructure and technical resources, which they would not be able to use if they had to invest capital to purchase each of its components.


What is PaaS (Platform as a Service)?


It is an external service of delivering the IT platform and a package of solutions, making applications dislocation easier without any entering costs, buying and managing hardware, software and upgrades.

The PaaS also enables clients to develop their own applications with the use of tools and services delivered by provider. PaaS provides services for developing, testing, dislocating, managing and hosting applications in one integrated environment. PaaS operates on IaaS.


What is necessary to use PaaS?


Connection to Internet.


What are the advantages of SaaS?


1. Lower costs. Using the PaaS, clients do not bear the costs of purchasing, installation and managing the IT infrastructure. It is the provider who takes care of upgrades and other routine performance to keep the system work accurately. If upgrades of the PaaS are implemented correctly, they will not disturb functions of applications they operate on.

2. Easy dislocation. Instead of worrying about infrastructure, the company executives may focus on development and innovations. Some providers offer a preliminary business functionality working out service to eliminate any errors while matching applications for PaaS.

3. Lower risk. No entering hardware and software investments means lower risk. With PaaS the only thing necessary is a computer connected to internet to start building up applications. Usage of an application is scalable from one user to tens of thousands of users without any changes to the application. The platform assigns resources to proper applications and users dynamically in appropriate time.

4. Supporting group. The PaaS providers offer creating an on-line users support group to share experiences in using the service, get new ideas and search advice from other users.