Many organizations are moving to the cloud to protect their infrastructure

example is Dropbox Business, which provides businesses with secure cloud storage but leaves them responsible for data management and security within that storage [2]. While IaaS offers scalability and cost-efficiency, it also demands a higher level of in-house IT expertise.

PaaS builds upon IaaS by offering a development environment with pre-configured tools and middleware. This allows organizations to focus on application development without managing underlying infrastructure. Heroku is a popular PaaS platform used by startups and developers to rapidly build and deploy web applications without worrying about server management [3]. PaaS offers faster development cycles and simplified infrastructure management, but often comes with limitations on customization compared to IaaS.

SaaS provides the most complete solution, offering on-demand access to pre-built applications over the internet. The cloud provider manages everything, including infrastructure, platform, and application software. Salesforce is a well-known SaaS CRM platform that businesses can access via a web browser, eliminating the need for software installation or maintenance [4]. SaaS offers ease of use, scalability, and lower upfront costs, but can be less customizable and may carry vendor lock-in risks.

Choosing the Right Model

The best cloud service model depends on an organization's specific needs. Here's a brief breakdown:

• IaaS: Ideal for organizations with strong IT expertise who require maximum control and customization.
• PaaS: Suited for organizations that want to focus on application development without managing infrastructure.
• SaaS: Perfect for businesses seeking easy-to-use, scalable applications with minimal upfront investment.

Ultimately, selecting the right model requires careful consideration of factors like technical expertise, budget constraints, desired level of control, and application requirements.

Sample Solution

The National Institute of Standards and Technology (NIST) defines three primary cloud computing service models: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS) [1]. Each model offers a distinct level of control and responsibility between the cloud provider and the organization.

IaaS provides the most fundamental layer, offering virtualized computing resources like servers, storage, and networking. The organization manages everything above the infrastructure layer, including operating systems, applications, and data. This model grants the most control but also requires significant technical expertise.