2.4.1 Cloud Applications or Software as a Service (SaaS) Software-as-a-Service or SaaS is the

The cloud can provide swift access to malleable and low budget IT resources. With the use of cloud computing, you are not required to make big direct investments in hardware and spend a lot of time on managing that hardware and associated services. Cloud Computing compromises a comprehensive set of on-demand services, such as global computing, storage, database, analytics, application, and deployment services. These services will assist an organization move quicker, reduce IT costs, and scale systems. Cloud Computing has three key categories, they are usually referred to as Infrastructure as a Service (IaaS), Platform as a Service (PaaS), Mobile as a Service (MaaS) and Software as a Service (SaaS).

As we learned in previous weeks, cloud computing services have three major different cloud architectures for different demanding customers. The three different architectures are Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS). For the words of the name, we can see the obvious differences among these three architectures, which they provide different cloud services based on their specific cloud architectures. What are the differences among these three cloud services? What are the responsibilities for the cloud services providers? What are the responsibilities for the customers? The following will discuss about these questions.

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]:

SaaS, or Software as a Service, portrays any cloud administration where buyers have the capacity to get to software/programming applications over the web. The applications are facilitated in "the cloud" and can be utilized for an extensive variety of errands for both people and companies. Google, Twitter, Facebook and Flickr are all samples of SaaS, with clients ready to get to the administrations by means of any web empowered gadget. Endeavor clients have the capacity to utilize applications for a scope of necessities,

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.

c. Platform as a service or the PaaS: Such services allow the clients to utilize developmental environments to design software applications.

This coordinates elements supporting high adaptability and multi-occupancy. In addition, distributed computing minimizes the capital consumption. This methodology is gadget and client area free. As indicated by the not at all like sorts of administrations offered, distributed computing can be considered to comprise of three layers. IaaS or Infrastructure as a Service (IaaS) is the most minimal layer that gives fundamental base bolster administration. PaaS - the Platform as a Service (PaaS) layer is the center layer, which offers stage arranged administrations, other than giving the earth to facilitating client 's applications. SaaS - Software as a Service (SaaS) is the highest layer which includes a complete application offered as administration on interest. SaaS guarantees that the complete applications are facilitated on the web and clients use them. The installment is being made on a pay-per-use model. It takes out the need to introduce and run the application on the client 's nearby PC, in this manner mitigating the client 's weight for programming consideration. In SaaS, there is the Divided Cloud and Convergence intelligibility instrument whereby each information thing has either the "Read Lock" or "Compose Lock". Two sorts of servers are utilized by SaaS: the Main Consistence Server (MCS) and Domain Consistence Server (DCS). Reserve rationality is

market needs. The primary goal of this research is to take an in depth look at PaaS

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

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

Cloud computing is a web based utility model. The user does not need to maintain any infrastructure that is to be managed by the provider that is cloud provider. The cloud provides different solutions for the software, platform oriented and the infrastructure. There are three types of services offered which are classified as (IaaS) Infrastructure as a Service, Platform as a service (PaaS) and Software as a Service (SaaS). These services can be deployed by its cloud models that can be private, public, hybrid and community model.

The three deliver methods of cloud computing/storage is software as a service (SaaS), Platform as a Service (PaaS) and Infrastructure as a Service (IaaS). The service provides on-demand pay per use and is independent of a platform.

The three service models are Software as a Service (SaaS), Platform as a Service (PaaS) and Infrastructure as a Service (IaaS). The aptitude that SaaS gives to the user is to use the provider’s applications functioning on a cloud infrastructure. The applications are accessible from any connected client devices. The user does not do anything with the cloud

Platform as a Service (PaaS) is where vendors (ex. Google and Microsoft) provide servers, tools, and utilities to allow the creation of applications capable of being deployed on the internet. Users manage the applications deployed and some environment settings but not the cloud network, O/S, or servers. The only hardware required for this model is a device to connect to the service. (Dulaney & Eastomm, 2014)