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Types of Cloud Service Models & Which One Should You Choose?

Cloud Computing is offered in three diverse help models which each fulfil an extraordinary arrangement of business necessities. These three cloud service models are referred to as Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS).

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What is Cloud Computing?

Cloud computing is the on-request accessibility of PC framework assets, mainly information stockpiling (cloud storage) and figuring power, without direct dynamic administration by the client.

Cloud Computing is offered in three diverse help models which each fulfil an extraordinary arrangement of business necessities. These three cloud service models are referred to as Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS).

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Software as a Service (SaaS)

Software-as-a-Service, or SaaS for short, is a cloud-based strategy for giving programming to clients. SaaS clients buy into an application instead of buying it once and introducing it. Clients can sign into and utilise a SaaS application from any viable gadget over the Internet. The real application runs in cloud workers that might be far eliminated from a client’s area.

What are the preferences and weaknesses of utilising SaaS?

The SaaS model has various advantages and disadvantages, even though for present-day organisations and clients, the professionals of SaaS regularly exceed the cons. Here is a portion of the preferences and weaknesses of utilising SaaS applications:

Access from anywhere, on any device.

Access from anyplace, on any gadget. Regularly, clients can sign into SaaS applications from any gadget and any area. Clients don’t have to reinstall SaaS applications or buy new licenses each time they change to another gadget.

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No need for updates

No requirement for updates or establishments. The SaaS supplier updates and fixes the application on a progressing premise.

Favourable position: Scalability

The SaaS supplier handles scaling up the application, for example, adding more information base space or more register power as use increments.

Preferred position: Cost reserve funds

SaaS reduces down on interior IT expenses and overhead. The SaaS supplier keeps up the workers and framework that help the application, and the main expense to a business is the membership cost of the application.

Burden: Vendor lock-in.

Now is the ideal time-devouring and costly to move to another application if an association’s whole information base is put away inside the old application.

Impediment (for ventures): Security and consistency

With SaaS applications, the obligation regarding ensuring those applications and their information moves from inside IT groups to the outer SaaS suppliers. For little to medium-sized organisations, this is (to a lesser degree) a weakness, as enormous cloud suppliers ordinarily have more assets for setting up solid security.

What are a few instances of SaaS organisations?

As referenced above, online email suppliers fit into the SaaS classification. Other notable SaaS organisations incorporate Salesforce, Slack, MailChimp, and Dropbox.

Read: Cloud Computing Ultimate Guide

Platform as a Service (PaaS)

In the Platform-as-a-Service (PaaS) model, designers lease all they require to construct an application, depending on a cloud supplier for development tools, infrastructure, and operating systems. This is one of the three cloud service models of distributed computing. PaaS immeasurably disentangles web application development; from the engineer’s point of view, all backend management happens in the background. 

What is remembered for PaaS?

The primary contributions included by PaaS merchants are:

  • Middleware
  • Operating systems
  • Database management
  • Infrastructure


Stages offered as a help ordinarily incorporate middleware, so designers don’t need to fabricate it themselves. Middleware is vital for running an application; however, end clients don’t communicate with it.

Operating systems

A PaaS seller will give and keep up the operating framework that designers take a shot at and the application runs on.


PaaS suppliers control and look after databases. They will, for the most part, give designers a database management framework too.


PaaS is the following layer up from IaaS in the distributed computing administration model, and everything remembered for IaaS is likewise remembered for PaaS. A PaaS supplier either oversees workers, stockpiling, and actual server farms, or buys them from an IaaS supplier.

For what reason do designers use PaaS?

Quicker and ideal opportunity to showcase

With PaaS, they should simply compose the code and test the application, and the seller handles the rest.

One climate beginning to end.

PaaS grants engineers to construct, test, investigate, convey, host, and update their applications all in a similar climate. This empowers engineers to be certain a web application will work as facilitated before their delivery appropriately, and it disentangles the application development lifecycle.


PaaS is savvier than utilising IaaS by and large. Overhead is decreased because PaaS clients don’t have to oversee and arrange virtual machines.

The simplicity of permitting.

PaaS suppliers handle all permitting for operating systems, development tools, and all that else remembered for their foundation.

Also Read: Top Cloud Computing Models Explained

What are the expected disadvantages of utilising PaaS?

Merchant lock-in

It might turn out to be difficult to switch PaaS suppliers since the application is constructed utilising the seller’s tools and explicitly for their foundation. To switch sellers, designers may have to either revamp or vigorously change their application.

Security and consistency challenges

In a PaaS engineering, the outer merchant will store most or the entirety of an application’s information, alongside facilitating its code. Now and again the merchant may store the databases through a further outsider, an IaaS supplier.

Infrastructure as a Service (IaaS)

IaaS is otherwise called Hardware as a Service (HaaS). It is a figuring foundation overseen over the web. The principle bit of leeway of utilising IaaS is that it encourages clients to stay away from the expense and unpredictability of buying and dealing with the actual workers.


Which one should you choose?

Freedom to make it exactly how you want – IaaS is best —->SaaS is least flexible like an App on your phone where you must accept updates and changes. 

The Effort to Set up and Maintain – IaaS is hardest —->SaaS is easiest because someone else does it for you.

Cost – Varies by often when you do a full analysis the bundled SaaS is cheaper over the entire lifespan of the application.

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Is Cloud computing safe for businesses?

Cloud computing is typically more secure than most private data centres. Providers of Cloud infrastructure also give tools and architectural alternatives for isolating workloads, encrypting data, and detecting possible threats. Parallely, public clouds operate on a shared responsibility paradigm, in which the user is responsible for the security of the data and applications stored on the Cloud. The security duties are divided differently depending on the cloud computing tier. Since the process of securing a cloud environment differs from that of a typical data centre, IT employees will have to learn new skills. The most prevalent Cloud security vulnerability is unauthorised access to resources, as numerous high-profile data breaches have come from misconfigurations.

What advantages does Cloud computing offer to businesses?

The supply of services such as storage, computation, network, technology, or applications from a centralised place is known as Cloud Computing. These services are offered through an organisation's internal specialised network or the Internet, and they provide several benefits to the company. To begin with, businesses do not need to own or manage on-premise data centres. Cloud services are compatible with a variety of devices and operating systems, and they provide enterprises with quick scalability, which improves organisational agility. When compared to on-premise physical environments, Cloud environments are often more secure. Cloud computing makes it simple to safeguard and backup company data since it is centralised. Finally, Cloud computing reduces employee onboarding time, particularly for remote workers.

How is Virtualisation different from Cloud Computing?

Virtualisation is the separation of the computing system's software from its physical infrastructure. This allows you to use the same computer to run various operating systems, middleware, and applications. Despite the fact that virtualisation is the technology that underpins clouds, their delivery differs. Cloud computing allows services to be delivered using virtualized infrastructure and platforms. This service is a ready-to-use business commodity, whereas virtualisation is a technical one that can be customised to meet your specific requirements. As a result, Cloud Computing might be considered the next step in the advancement of Virtualisation.

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