What Is IaaS: Infrastructure As A Service Explained

Living in this age of the internet, we have got so much dependency on cloud computing. Most of the services that we use in our daily life are based on cloud computing structure. Cloud-computing is divided into three main categories i.e. PaaS (Platform as a Service), SaaS (Software as a Service), and IaaS (Infrastructure as a Service). Here, we are going to talk about IaaS in particular. If you are one such person wondering what is IaaS, this article is for you. 

What is IaaS (in brief)?

IaaS stands for Infrastructure as a Service and it is used to provide virtualised resources for computing. There are other categories as well where the resources are centralised, unlike IaaS. IaaS is able to provide such virtualised resources to the clients using the internet.

Most people perceive IaaS same as PaaS but there is a difference. There are several infrastructure components in cloud computing. The difference between PaaS and IaaS lies in the fact that which components are controlled by the vendor and the client. 

IaaS vs PaaS
IaaS vs PaaS

The boxes in blue contain those components that are managed by the vendors. Components that are in Green are the ones that the user manages in the case IaaS and PaaS.

By looking at the table mentioned above, you can see the difference between IaaS and PaaS. Any user can choose one of these based on their requirements. 

Architecture of IaaS

This is one of the important aspects that you should know if you are asking about IaaS? You can simply understand the architecture of IaaS by looking at the figure above. In the case of IaaS, the components like Middleware, Runtime, etc. are present on the vendor side, unlike PaaS. All these components are in the data centres. There are several services offered by IaaS like security, load balancing, backup, and recovery. Several other services are there as well. All such services can be used to install all the elements of the application. 

The best thing about the services offered by IaaS is that these services are run by policies. So, the user has a lot of control over all such services. The user can modify the policies for getting maximum benefits and better automation as per the demands. The loads may differ based on several situations. And the policies are also modifiable for adapting to such requirements. 

All the services offered by Infrastructure as a Service are accessed using the internet. Another great feature that IaaS offers is the ability to install Virtual Machines. Different virtual machines can run on different operating systems. And then the user can deploy databases and backups on each VM. This way the structure will be made into several components for different purposes. 

No matter which cloud computing model you are going for, you will always need a third-party service provider. That provider should specialise in selling IaaS. One of the biggest independent providers in this category are GCP (Google Cloud Platform), and AWS (Amazon Web Services). 

Most popular IaaS products and the vendors

There are different products and vendors in the markets. It depends on the user that what he should opt for. In this section of the article, we are going to talk about some of the best products in the market. The costs involved here differ based on the services provided and the quality of services. Though there is a wide range of services offered by a lot of companies. Discussing all such products is beyond the scope of this article. 

AWS is one of the most preferred ones at this time. Major products are Glacier, and Simple Storage Services (popularly known as S3). These two are primarily storage services. AWS also offers Infrastructure as a Service for computing services like Elastic Compute Cloud (EC2).

Google is also very popular in this field. It offers such services through Google Compute Engine (GCE). 

Microsoft also offers similar services via Azure. 

IaaS vendors also provide serverless services. This is offered through Azure Functions by Microsoft, Lambda by AWS, and Google Cloud Functions by Google. There are several other services as well like big data compute environments, logging, monitoring, and database access. 

Many small vendors are also there in the market. Such vendors include Digital Ocean, and Rackspace Managed Cloud, etc. 

Pros and Cons of IaaS

We have discussed several details about IaaS. Those details are enough to answer your query about IaaS. But here are going to look at the advantages and disadvantages of IaaS. Any technology has some advantages and disadvantages too. But going for the one that gives optimizes your overall growth is always a wise decision. 


The biggest benefit of using IaaS is that the user doesn’t have to spend money on building infrastructure for such services. All the services that are needed can be leased by a third party vendor. This way, the user can manage the workload in a very easy and fast way and save a lot of money as well. 

IaaS works as the best temporary solution for your business. Those who are starting a business need something to rely on while developing their software. Infrastructure as a Service is the best solution for them in such a situation. Once their infrastructure is tested and ready, they can switch to their permanent infrastructure. If some business has demanded that an IaaS can fulfil at low costs for a long-duration should rely on IaaS permanently. There is no need to spend money on building their own infrastructure. 

As in most cases, customers use this service on a pay per use basis. This way the cost involved here becomes even cheaper than deploying your software and hardware for this purpose. 


Many users complain that they are charged higher than expected. And this happens because the overall service charge is classified into different varieties of service. Then users are charges based on their precise usage of specific services. This will be avoided by proper knowledge.

Most of the IaaS software have their own infrastructure which means there is a lack of transparency. When you are not completely aware of the infrastructure, you may face some difficulties in doing your work. 

These services very much rely on the provider. If your service provider faces some issue, your work will also be disrupted. 


We have mentioned several details to answer your Infrastructure as a Service questions. At last, it depends on your demands and capabilities while choosing any service. 

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