Categorization of Cloud Computing Services.


Categorization of Cloud Computing Services

In today’s IT world, Cloud Computing plays a very crucial role. It is a set of computing services like servers, storage, databases, networking, software, analytics etc on the Internet . Companies giving these computing services are called cloud service providers and typically charge for cloud computing services based on usage, similar to how we are billed for water or electricity at home.

Major categorization of cloud computing services are:

  1. Software-as-a-service(SaaS)
  2. Platform-as-a-service(Paas)
  3. Infrastructure-as-a-service(IaaS)

SaaS,PaaS and IaaS


Software as a service(SaaS) fulfills organisation’s needs i.e. they don’t need to install and run the applications on their personal computers or any other data centers. SaaS is a software distribution model in which a third-party software provider hosts applications and makes them available to clients online. SaaS is categorized as one of three main categories of cloud computing, the others are,  infrastructure as a service (IaaS) and platform as a service (PaaS).

Software as a service(SaaS)

Advantages of using SaaS: –

  • Flexible payments: Clients subscribe to SaaS rather than purchasing a software to install, or configuring additional hardware. Usually clients pay for the SaaS offering on a monthly basis, this allows many businesses to exercise better and more predictable budgeting.
  • Efficient Usage: Saas offers scalable cloud services i.e. clients can access more features and services efficiently.
  • Frequent and Automatic updates:  Rather than purchasing a new software, clients can use a SaaS provider to automatically perform updates of services. This reduces the burden on in-house IT staff.
  • Accessibility and persistence: SaaS applications are delivered online, so the users can access them from any Internet-enabled device and location.



Platform-as-a-service(PaaS) works at a lower level than SaaS. Basically provides a platform on which a software can be developed and deployed. PaaS providers are dedicated to work for dealing with servers and give clients an environment in which the operating system and server software as well as the server hardware and network infrastructure are taken care of, It helps users to focus on the business side freely, and develop their applications.

Unlike all cloud services, PaaS is built on top of virtualization technology. Businesses can store their resources as they need them, scaling as demand grows, rather than investing in hardware with redundant resources.


Advantages of PaaS:-

  • Quick testing and deployment: PaaS allows development teams to try different configurations. Such as multiple types of machines and on different locations to test the applications for scalability and compatibility which cannot be done on a local environment. Through a quick testing process, deployment becomes faster too.
  • Dynamic allocation: Now-a-days development team needs a flexible environment for quick testing and putting a new feature in the application or service. Testing these features on a small section of clients before making them available to the entire world. With PaaS offering, such tasks have now become possible.
  • Increased focus on business and boost to internal development: As the development companies no longer need to make efforts on the maintenance and choice of systems, they can focus more on their core business. With PaaS, quicker development and deployment of infrastructure on line is possible.
  • Strengthen Security: Security is crucial advantage of PaaS. A PaaS offering provides continuous security updates for individual stack components as they are issued. Security vulnerabilities in core language or framework components are quickly resolved.

Infrastructure-as-a-Service(IaaS): –

Infrastructure as a service (IaaS) is a form of cloud computing that provides virtualized computing resources over the internet.The IaaS provider also supplies a range of services to accompany those infrastructure components.

IaaS clients access resources and services through a wide area network (WAN). Such as the internet, and they can use the cloud service providers to install the remaining features of an application i.e. the client can log in to the IaaS platform to create virtual machines (VMs), install operating systems in each VM; deploy middle-ware, such as databases; create storage buckets for workloads and backups; and install the workload into that VM.


Advantages of IaaS: –

  • Anytime, Anywhere Access – With the application infrastructure in the cloud, we are able to access the infrastructure via a simple Internet connection.
  • Flexible Options – In today’s IT world, Keeping up with ever-changing needs can be challenging.  With IaaS, organizations can choose the computing power and storage capacity that fits their specific needs at that time.
  • No Capital Investments – There is no need to make additional investments in a computing infrastructure, maintenance or work space to store the application.  Most IaaS solutions are offered using a “pay-as-you-go” subscription-based plan. That allows clients to only pay for what they need at that time.
  • Expand as You Grow – By paying for only what you need and ascending the infrastructure of the service provider. IaaS allows organizations to make efficient moves as they grow and back if they downsize or have changes in their operations.

Comparison Of SaaS,PaaS and Iaas: –

Comparison Of SaaS,PaaS and Iaas


In a few years, cloud computing will be essential for the continuity of the Internet itself as a whole. Cloud computing services improves the resource utilization. One can request for the resources at the time of need. No unnecessary resources will be consumed. It makes the system more cost effective.

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