The different models of Cloud Computing

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Last updated: July 3, 2022

Cloud Computing is revolutionizing the way business data is backed up. Thanks to the cloud, businesses benefit from greater flexibility and lower costs. However, cloud computing is also risky.

Information security, data protection and law enforcement are among the issues for further consideration.

I gave you in the previous article the dangers of the cloud Comptuing, in this article we will see in detail what are the different Cloud computing service models: IAAS for the hardware, EASTER for middleware and SAAS for software.


Le cloud model the best known is the infrastructure cloud or IaaS. It is a model where the company has a paid subscription to an IT infrastructure (servers, storage, network) which is physically located with the supplier.

Previously, the client company rented a physical server with well-defined characteristics, it can now rent a server whose resources can evolve according to its needs dynamically. In IaaS, only the hardware infrastructure is dematerialized. As for example computer archiving for backup reasons which is done by companies that do not want to have the data internally.


This type of Cloud Computing makes it possible to provide businesses or individuals with a rapidly available runtime environment, by letting them control the applications that they can install, configure and use themselves. It allows you to outsource the hardware infrastructure, but also middleware applications (database, programming language).
These platforms are therefore directly usable by publishers who will offer their software in Cloud mode. It therefore makes it possible to host applications that are not suited to the SaaS model.

PAAS offers generally include the concepts of processor time, storage space used and bandwidth consumed. The user company will then pay according to what it has consumed.


Finally, the most successful version of Cloud Computing is the SAAS mode for Software As A service.
Here, the user company is completely detached from hardware and software issues.
The SAAS is in fact the proposition of software packages in service mode without operations for the company which uses them. SAAS therefore offers applications made available to end users. You will only need an internet connection and a browser and the applications can then be accessed via a computer but also a smartphone or tablet.
Known examples of software sold in SaaS are Google Apps, Office Web Apps or Microsoft Live.

Here is a diagram which illustrates the characteristics of the three main models of use of Cloud: