IaaS vs SaaS vs PaaS: A guide to Azure cloud service types (2024)

IaaS vs SaaS vs PaaS: A guide to Azure cloud service types (1)

It’s 2019, so we’ll assume you’ve heard of cloud computing by now.

Even so, if you’re not super tech-savvy, you might still be a little cloudy on terms like IaaS, PaaS, and SaaS, and the differences between them.

And that’s fine. This whole cloud thing is very new and can be pretty confusing with its many acronyms and jargon. But the fact is that cloud computing is the future, and the future is here. If you and your business want to stay productive and competitive, you’re going to need to hop aboard the cloud train.

If you’re thinking about implementing cloud computing in your organization, you’re going to want to know about these services. Worry not, we’re going to demystify “as a service” and explain how Microsoft Azure can help you take advantage of them.

As a Service: The basics

IaaS, PaaS, and SaaS are essentially the three main pillars of cloud computing. These easily confusable abbreviations stand for:

  • Infrastructure as a Service (IaaS)
  • Platform as a Service (PaaS)
  • Software as a Service (SaaS)

“As a service” simply means a facility, usually related to IT, computing, or telecommunications, that’s available to its users as a service, rather than something they install and operate themselves through their own hardware. These services are accessed through the internet.

For example, a few years ago if you wanted to be able to create and edit documents, you might have purchased Microsoft Word. This purchase probably entailed buying a disc containing the software, installing it on your computer. A one-time purchase, after handing over your cash you’d be able to use Word forever (this kind of software purchase is known as a perpetual license). If you wanted to update Word to get new features, you’d have to download the update and install it on your computer. That software would be run on, and therefore only accessible from, the computer that it was installed on.

Now, Word is available “as a service.” Rather than having to download Word and use it on a single device, customers can use a SaaS version that’s hosted on Microsoft’s internal servers. Instead of paying for the software outright, customers pay a subscription fee to access it; Word then becomes less of a product people purchase, and more of a service they pay to use.

The benefits of “as a service” models are enormous. Here are just a few:

Lower cost

You don’t have to have a big chunk of cash upfront to buy the software. Instead, you can pay a smaller price on a monthly or yearly basis. Not only does this make the software more accessible, but it also means that if you decide you don’t need it anymore, you can simply cancel the subscription without being lumbered with an expensive tool that you don’t use.

More flexible

If you have a piece of software installed on your home computer, that’s the only place you can use it. With a SaaS version, you just log in to a website from any device—whether that’s your laptop, your phone, your tablet, a public computer, your work computer, your mom’s computer… you get the idea—and you can use the software.

Always up to date

As it’s based on the vendor’s own servers, you’ll always be presented with the latest version of your “as a service” product, without you having to manually download and install updates.

Better features

Generally speaking, software vendors are focusing more on cloud versions of their products, so embracing SaaS means you get access to the best and newest features. Plus, because they’re powered by the cloud, SaaS products are more powerful and capable of much more than a traditional version (which can only do as much as your computer can process).

Less demanding on infrastructure

If your computer isn’t powerful or new enough to run certain software, you don’t have to miss out. SaaS software isn’t run from your machine, so as long as you can connect to the internet, you don’t need to buy or maintain hardware, which saves you time and money.

IaaS vs SaaS vs PaaS: A guide to Azure cloud service types (2)

What is IaaS?

Before we go into what Infrastructure as a Service is, it’s worth taking a second to define exactly what we mean by infrastructure when it comes to computing.

Infrastructure is the digital scaffolding that supports a computer system; the really important back-end things like servers and storage, networks, security, and data centers. Traditionally, these aspects of computing would be the responsibility of an organization’s own IT department, housed and managed under its own roof.

IaaS gives businesses the option to have a vendor provide and manage these things on their end. This service enables companies to get rid of the hassle of having to operate infrastructure and hardware of their own.

Through IaaS, businesses can access the amount of computing, storage, and networking power they need over the internet from a third-party provider, giving them the freedom to access an IT environment that suits their needs, and can be scaled up or down as required without forking out for additional servers or hardware.

IaaS providers can deliver and manage services like firewalls, network connections, load balancers, data storage, and identity management. With these resources taken care of, businesses can take this infrastructure and build on it, installing operating systems, creating databases, and storing files.

What is PaaS?

If IaaS is at the bottom of the cloud computing pyramid, covering the fundamental infrastructure on which all other computing factors are built, then PaaS sits in the middle.

Customers can use PaaS to bolt cloud capabilities onto their own existing network. The PaaS model provides businesses with cloud components for certain software, offering a cloud-based framework on which developers can build and deploy custom applications.

Just as IaaS gives businesses the frameworks to build a computing environment that suits their needs, PaaS gives businesses the digital platform to develop and deploy their own apps and services, without the need to maintain server space, programming software, and security protocols internally.

The main difference between IaaS and PaaS is that with PaaS, the customer is consuming the core service needed for the own applications, and the “under the hood” management is left to the cloud vendor.

Using PaaS, businesses can create and develop services of their own on an existing platform, using tools that they can license from a third party vendor who’ll take care of all the updates and management of that platform. PaaS makes it faster, cheaper, and simpler for businesses to build their products and services, and scale their resources as needed without significant financial outlay.

In an era when consumers expect great experiences on mobile and on the web, being able to access platforms on which to create apps and services quickly and easily is essential; that’s a major reason why PaaS has become so popular.

Heroku, Salesforce, and Google App Engine are all common examples of PaaS; they provide a platform on which users can build and run their own software.

What is SaaS?

SaaS, or software as a service, is a model through which software is delivered via the internet, rather than being downloaded onto individual devices. The software is managed by a third-party vendor, and is typically accessed through an app or a web browser.

With SaaS, every aspect of the software’s hosting, setup, and maintenance is handled by its vendor. All you need to do to access it is log in to an app or browser, and use the software in the same way as you would a traditional desktop application installed on your own computer.

All of your data, files, and usage history is stored at the vendor’s end, within a multi-tenancy cloud; essentially a huge network of centrally maintained servers shared by all the software’s users. As a result, the software is accessible from anywhere, on any device, and data is always backed up to a centralized location—but your information can’t be seen or accessed by other software users.

Office 365, Google Drive, DropBox, Slack, MailChimp, and Netflix are all SaaS applications.

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Phew. Anything else I need to know about?

Infrastructure, platform, and software are the three titans of cloud computing, however, as the tech has advanced, more uses for the cloud have cropped up, meaning there are countless other “as a Service” models out there. And it’s likely that they’ll just keep coming (sorry). On the bright side, there are now so many service types that many in the IT community have started using the catch-all term XaaS; meaning anything as a service.

Here are some of the more common fringe service models you might come across:

DbaaS (Database as a Service)

This one is pretty self-explanatory. DbaaS are databases hosted on a vendor’s servers, where you can store and access structured data. One of the big advantages offered by DbaaS is that your data enjoys high availability, tight security, and is protected against loss. Employing DbaaS also means you don’t have to run your own servers to house all your data.

FaaS (Functions as a Service)

FaaS is essentially a simpler version of PaaS. Known as serverless architecture, FaaS is auto-scalable, and uses trigger events to run functions without having to worry about deployment or server resources.

AaaS (Analytics as a Service)

Also known as Insights as a Service, AaaS is any web-delivered platform that provides analytical capabilities, including big data management and visualization. AaaS platforms give companies access to tools like machine learning and AI on an on-demand basis, so they can enjoy cutting-edge analytical technology and avoid the heavy lifting of developing these tools themselves.

SECaaS (Security as a Service)

As our use of cloud technology increases, security becomes an ever-more pressing concern, and organizations large and small are targeted by cybercriminals every single day. Security as a service is enabling even companies who don’t have the resource to run the necessary security processes in-house to utilize enterprise-grade protocols by outsourcing their security management and monitoring.

VaaS (Virtualization as a Service)

Virtualization is a key component of modern cloud computing. VaaS delivers isolated virtual machines (VMs), hosted by the vendor, that can be customized to meet customer needs.

Not sure what a virtual machine is exactly? A virtual machine is a computer file, sometimes called an image, that acts like a real computer. VMs typically run in a window like traditional computer programs.

This computer-within-a-computer is boxed off from the rest of the system, so that any changes made or software run within the VM won’t “leak” into the host machine. VMs provide a sandbox environment in which developers can safely test things like beta releases, access virus-infected data, build system backups, and run applications on operating systems they may not be naturally compatible with, without the risk of damage to the wider system.

Several VMs can be run simultaneously on the same machine, and each VM has its own virtual hardware, including CPUs, memory, hard drives, network interfaces, and other devices. The virtual hardware can be mapped to the physical hardware, cutting costs by reducing reliance on actual hardware systems and their associated maintenance costs.

Is Azure IaaS or PaaS?

Azure offers all three of the core service models we’ve looked at, so, depending on which of Azure’s many services you opt for, you can take advantage of IaaS, PaaS, and SaaS on Microsoft’s cloud platform.

Now we know what all these service models are and what they do, it’s time to find out how Microsoft Azure can help you can utilize them in your business.

IaaS on Azure

Azure’s IaaS offering lets customers outsource all their network and computing needs to Microsoft, removing all infrastructure from the customer’s own servers and basing it all at Microsoft’s end. All infrastructure is managed on the customer’s behalf, leaving you to purchase, install, configure, and operate the software that runs on it, such as operating systems, apps, and middleware.

Azure can provide a virtual data center, complete with security features, through which businesses can host websites, store and backup data, develop and test environments, build web apps, and run high-performance computing.

Azure offers a massive range of IaaS facilities depending on the needs of your business, from compute and networking to security and storage, including Container Service and Virtual Machines. Find out more about individual services here.

PaaS on Azure

If you prefer to go down the PaaS route on Azure, there’s no shortage of services to help you implement a cloud-powered development platform. Through PaaS services like app Services, Azure Search, and Azure CDN, Azure offers everything companies need to deliver cloud applications on a pay-as-you-go basis, from the smallest web apps to enterprise-level software.

Azure’s PaaS offerings give developers total control over their application, allowing them the freedom to work on building, safe in the knowledge that things like OS patches or load balancing will just work. With services like Azure Functions, businesses can take advantage of PaaS power without having to worry about server configuration or scaling, which is automatic.

SaaS on Azure

Azure can be used both to host apps you’ve created yourself, and to access other Microsoft SaaS services. Cloud-based Microsoft products like Dynamics 365, Outlook, and Office 365 are all built and hosted on Azure.

Using Azure as a foundation for your SaaS apps lets you take advantage of powerful technology and intelligent tools like analytics and machine learning.

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IaaS vs SaaS vs PaaS: A guide to Azure cloud service types (2024)

FAQs

IaaS vs SaaS vs PaaS: A guide to Azure cloud service types? ›

To summarize, IaaS provides virtual computing resources, PaaS provides a platform for developing and deploying applications, and SaaS provides access to software applications hosted and maintained by Microsoft.

What is the difference between IaaS PaaS and SaaS in Azure? ›

IaaS builds the infrastructure of cloud-based technology. PaaS helps developers build custom apps via an API that can be delivered over the cloud. And, SaaS is cloud-based software companies can sell and use.

What is the difference between cloud computing service model SaaS PaaS and IaaS? ›

Companies that use SaaS don't have to manage their data use or maintain their applications. With PaaS and IaaS, however, users must manage their own data use and applications. SaaS and PaaS providers manage organizations' operating systems, but IaaS users must handle their own operating systems.

What is IaaS vs PaaS vs SaaS easy? ›

Unlike the IaaS model, PaaS providers manage runtime, middleware, and operating systems. However, PaaS customers still get to manage data and applications—in contrast to the SaaS model, where customers don't have to manage anything. So in terms of the cloud continuum, PaaS fits snugly between IaaS and SaaS.

What are 3 examples of IaaS? ›

Examples of IaaS include Rackspace, Amazon Web Services (AWS) Elastic Compute Cloud (EC2), Microsoft Azure, Google Compute Engine (GCE) and Joyent.

What are the examples of IaaS PaaS and SaaS? ›

Common examples of PaaS, SaaS, and IaaS
PlatformExamples
PaaSAWS Elastic Beanstalk, Google App Engine, and Adobe Commerce
SaaSGmail, Slack, and Microsoft Office 365
IaaSAmazon Web Services, Microsoft Azure, and Google Compute Engine
Nov 14, 2023

How do I choose between IaaS PaaS and SaaS? ›

IaaS provides you the most freedom of control as it lets you manage your applications, data, middleware, and operating system. On the other hand, PaaS allows you to manage your data and applications only, and with SaaS, everything is managed by your service provider.

Is Azure a PaaS or IaaS? ›

They are IaaS since Azure Storage Services provide the fundamental building blocks for cloud-based applications and services, where you get raw storage capacity (like a hard drive in the cloud) and are responsible for how you manage and utilize that capacity.

What is the difference between IaaS and PaaS database? ›

However, with the IaaS option you need to invest extra time and resources to manage your database, while in PaaS you get administration features included in the price. Both PaaS and IaaS options give you the ability to pause your resources to help reduce administration costs.

Which of the following is the most significant difference between SaaS and IaaS? ›

The most significant distinction between SaaS and IaaS lies in what they provide access to. SaaS is a cloud-based software application that is delivered over the internet on a subscription basis. On the other hand, IaaS offers virtualized computing resources over the internet.

Is Netflix A SaaS? ›

Netflix is indeed an SaaS company that sells software to watch licensed videos on demand. It follows a subscription-based model whereby the customer chooses a subscription plan and pays a fixed sum of money to Netflix monthly or annually.

Why is SaaS better than PaaS? ›

PaaS is most often built on top of an IaaS platform to reduce the need for system administration. It allows you to focus on app development instead of infrastructure management. SaaS offers ready-to-use, out-of-the-box solutions that meet a particular business need (such as a website or email).

Is Snowflake a PaaS or SaaS? ›

Snowflake Data Cloud allows you to run all your critical data workloads on one platform, including data sharing, data lake, data warehouse,, and custom development capabilities, in effect also serving as a data PaaS.

Is Amazon a PaaS or IaaS? ›

AWS (Amazon Web Services) is a comprehensive, evolving cloud computing platform provided by Amazon. It includes a mixture of infrastructure-as-a-service (IaaS), platform-as-a-service (PaaS) and packaged software-as-a-service (SaaS) offerings.

Is EC2 a PaaS or IaaS? ›

IaaS works primarily with cloud-based and pay-as-you-go services such as storage, networking and virtualization. Examples of popular IaaS providers include: AWS EC2.

What are examples of IaaS in Azure? ›

Build infrastructure solutions with Azure IaaS services and products
  • Compute. Access cloud compute capacity, virtualisation and scale on demand—and only pay for the resources you use.
  • Storage. ...
  • Networking. ...
  • Security. ...
  • Management. ...
  • Azure Virtual Desktop. ...
  • Hybrid cloud solutions. ...
  • High-performance computing (HPC)

Is Azure an IaaS or PaaS? ›

They are IaaS since Azure Storage Services provide the fundamental building blocks for cloud-based applications and services, where you get raw storage capacity (like a hard drive in the cloud) and are responsible for how you manage and utilize that capacity.

Is Azure App Service PaaS or SaaS? ›

Azure App Service is considered an excellent Platform as a Service (PaaS), offering an application platform for developers to build Web, mobile and API applications.

Is Azure functions a PaaS or SaaS service? ›

Azure App Service and Azure Container Apps are PaaS services. Functions as a service (FaaS): Lets you deploy your code to the service, which automatically runs it. Azure Functions is a FaaS service.

Is Azure Active Directory SaaS or PaaS? ›

As a result, Azure AD is categorized as a SaaS solution under the Microsoft Azure cloud platform.

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