IaaS, PaaS and SaaS refer to three important concepts that underpin cloud computing service models. These acronyms stand for Infrastructure as a Service, Platform as a Service and Software as a Service.
Key features of each Service Model
Cloud computing offers different business service models, each with specific characteristics. The main features of IaaS, PaaS and SaaS can be listed as follows:
IaaS (Infrastructure as a Service)
It provides the business with virtual infrastructure resources, i.e. key components such as servers, storage and networking. Companies gain the ability to manage their own operating systems, applications and data. They can scale their infrastructure resources, meaning they can add more or less resources as needed.
PaaS (Platform as a Service)
It provides businesses with an application development platform. This platform facilitates software development. Businesses can create their applications without focusing on details such as application coding and database management. It accelerates application development and enables businesses to create innovative applications.
SaaS (Software as a Service)
It provides ready-to-use software for businesses. Users can access this software over the internet. Businesses don’t have to worry about maintaining and updating the software, as this task is handled by the cloud provider. Firms typically use this software on a subscription model and pay according to the number of users. Each service model offers different advantages according to the needs and resources of businesses. Therefore, businesses should think carefully when making their choice and identify the cloud service model that best suits their needs.
Key Differences between Service Models
While IaaS, PaaS and SaaS represent the basic service models in cloud computing, the main differences between them are in functionality, level of control and how responsibilities are distributed. The main differences between these service models are:
Functionality
IaaS:
Infrastructure as a Service provides businesses with specific, basic IT infrastructure such as servers, storage and network resources. Companies build their operating systems and applications on this infrastructure.
PaaS:
Platform as a Service provides a platform for application development and deployment. Companies build their applications without focusing on details such as application coding and database management.
SaaS:
Software as a service provides ready-made software that users can use directly. Users can access this software via the internet and maintenance and updates are usually the responsibility of the supplier.
Allocation of Responsibilities
IaaS:
Infrastructure as a service requires companies to manage the hardware and operating systems. The security and application layers are the responsibility of the company.
PaaS:
Platform as a Service allows businesses to focus on application development, but application security and performance are the responsibility of the business.
SaaS:
As a software service, tasks such as security, data backup and system updates are usually the responsibility of the provider.
These key differences help businesses determine the type of control, functionality and level of responsibility they prefer when choosing a cloud service model.
Determining Which Service Model is Suitable for Businesses
Businesses should consider several factors when determining which cloud service model is best for them. Some of these factors include:
Business Processes and Needs
Companies should assess their business processes and technology needs. Since IaaS, PaaS and SaaS each offer different capabilities, your processes and business needs will help you decide what you need.
Control Level
Companies should assess their level of control. IaaS offers more control and may therefore be suitable for businesses that want full control over their hardware and operating systems. In contrast, SaaS offers less control but is easy to use.
Budget and Costs
Operating budget and cost constraints should also be taken into account. Each service model has a different cost structure.
Staff Capabilities
Businesses should consider the skills and expertise of their IT staff. PaaS and SaaS require less expertise in software development capabilities, while IaaS may require more technical skills.
Security and Compliance Requirements
Businesses’ security and compliance requirements influence the choice of service model. Businesses that manage sensitive data may require more control and security.
