Cloud Service Types : Cloud Services

process. For instance, one important use of PaaS is that it allows for the development of SaaS,

Cloud computing offers services to users based on on-demand self-service, broad network access, measured service, resource pooling and rapid elasticity; These characteristics promise a faster time for implementation, lower cost, superior scalability and a better end user satisfaction. These services are delivered in models known as Software As A service (SaaS), Platform As A Service (PAAS), and Infrastructure As A Service (IAAS). The first layer which is the Software As A service (SaaS) is the layer in which software applications are delivered to end users. Below is the Platform As A Service (PAAS) layer which offers a platform on which applications can be developed. The lowest layer is the Infrastructure As A Service (IAAS) layer, in this layer the physical servers and network infrastructure is offered as a service. These services can be deployed throughout the internet (Public Cloud Computing), on the intranet infrastructure, (Private Cloud Computing), in a shared community of private networks (Community Cloud Computing), or a hybrid of both (Hybrid Cloud Computing). The service deployment models are [8]:

PaaS – Platform as a Service – Cloud providers deliver a platform, including operating system, programming language, database and web servers that developers can use to develop and run their software on a cloud platform without the cost and complexity of buying and managing hardware and software.

Cloud computing is be increasingly common in distributed computing medium. Data storage and processing utilizing cloud medium is be a way worldwide. Software as a Service (SaaS) , one of main models of cloud that might be presented in a public, private or hybrid network. whether we look at the effect SaaS has on many business applications in addition to in our day to day life, we could simply say that this deactivated technology is thither to stay. we could simply say that this deactivated technology is thither to stay. Cloud computing could be visible as Internet-based computing, in which software, the resources shared, and input are created obtainable to hardware 's on request . however utilizing a cloud computing model could

These administrations are extensively separated into three classifications: Infrastructure-as-a-Service (Iaas), Platform-as-a-Service (Paas) and Software-as-a-Service (Saas). Cloud computing was named motivated by the cloud image that is frequently used over the Internet through diagrams or flowcharts. Input data is analysed, collected and stored in one big online server which an authorized particular person can get access to. Margaret Rouse (December 2010). Moreover, four deployment models that have been used to deliver cloud services are private, public, community and hybrid. Private cloud is used by single organization to be able to

PaaS (Platform as a Service) - Network Storage nodes and instances of Software development and hosting platforms are accessed over a remote length.

There are three service models for Cloud Computing, SaaS (Software as a Service), Paas (Platform as a Service), IaaS (Infrastructure as a Service). It is important for businesses to fully understand the knowledge about each models before investing on Cloud Computing.

Cloud computing, in its most basic form, is “using computer services [such as computer and data storage, management and processing] that are delivered over a network” (Kim & Solomon, 2013, p. 189). For example, an organization may require a great deal of storage for their data but may not want to purchase the servers, the physical space for the servers, or the personnel to manage the infrastructure. Instead, they take advantage of the many cloud computing options and outsource their needs, hiring someone to do everything off-site usually with the goal of reducing their overall cost of ownership. As defined by the National Institute of Standards and Technology (NIST), cloud computing has five essential characteristics, three service models, and four deployment models (Mell & Grance, 2011) which will be covered, briefly, in the next few sections.

Over the years, cloud computing has become and innovating solution for companies to use to keep pace with managing business needs and the corresponding IT requirements. One specific realm in cloud computing called Software as a Service (SaaS) is the notion where third party companies (such as SalesForce.com, Taleo, and NetSuite) provide powerful applications to meet business needs via the web (e.g. the cloud). Software as a service

The PaaS model is particularly oriented towards developers, who need to run their applications without having the need to configure an entire network architecture of VMs and manage multiple application updates and upgrades. This delivery model allows developers to manage only their code and the data structures, everything else (runtime, OS, VMs, VMMs, networks,...) is then managed by the cloud provider.

of organization, are discussed. Characteristics of cloud computing discussed to get idea what the cloud computing is all about using. In addition to that, deployment model of cloud computing is discussed in greater detail to explain cloud computing can be used as public, private or hybrid type. Based on service delivery cloud computing divided into three types Infrastructure-as-a-Service (IaaS), Platform-as-a-Service (PaaS) and Software-as-a-Service (SaaS) are explained further in this section.

SaaS is a cloud computing model where the service provider is responsible for managing the entire cloud infrastructure, platform and is also responsible for the secure deployment and management of the customer-required applications such as office suite applications - that is why SaaS is sometimes referred to as “finished services” (Squicciarini, et al., 2016).

PaaS provides sets of services and workflows that targets developers, who can use shared tools, technologies, processes and APIs to fast

Platform as a Service (PaaS): In this service, they provide you a platform software to develop or build applications.

Platform as a Service(Paas) is a newer direction than SaaS, which is offered to developers of cloud applications. Developers that come to such vendors