We've already heard you say: SaaS, PaaS, IaaS, it's been a few years since these concepts arrived on our screens, so why write an article on the subject? Because, as overused as they may seem in 2023, these terms remain vague for some of us. So, without judgement, we'd like to take a look at the key concepts behind cloud computing.

What is "Infrastructure As A Service" (IaaS)?

cloud computing can be divided into three models: IaaS refers to the basic elements of IT that can be rented: physical or virtual servers, storage and networking. IaaS is for companies that want to create applications "from scratch" and control almost all the elements themselves. This requires companies to have the technical skills to orchestrate these services.

Vous voulez en savoir plus ? Téléchargez notre livre blanc « 27 points pour comprendre les enjeux du Cloud Computing »

A study carried out by Oracle revealed that two-thirds of IaaS users said that using online infrastructure made it easier for them to innovate, deploy new applications and services, and reduce maintenance costs. Despite this enthusiasm, IaaS also has its limits. And half of the companies surveyed also believe that IaaS is not sufficiently secure for most critical data.

What is "Platform As A Service" (PaaS)?

PaaS is the next layer: storage, networking and virtual servers. It could also include the tools and software that developers need to create applications (middleware, databases, operating systems and development tools). It provides access to a multitude of services and resources, from cloud to enterprise applications. For a fee, you can acquire the resources you need from a service provider cloud, via the Internet.

What is "Software As A Service" (SaaS)?

Le SaaS est la fourniture d’applications, la plus répandue dans le monde du cloud computing. Le matériel et le système d’exploitation sous-jacents ne sont pas pertinents pour l’utilisateur·ice final·e, qui accédera au service via un navigateur Web ou une application. Selon les chercheurs et chercheuses IDC, le SaaS est et restera, le modèle informatique dominant à moyen terme , représentant les deux tiers de toutes les dépenses consacrées au cloud public en 2017, mais ne baissant que légèrement pour atteindre un peu moins de 60% en 2021. IDC indique que les dépenses seraient dominées par les achats d’applications, qui représentent plus de la moitié de toutes les dépenses relatives au cloud public jusqu’en 2019. Les applications de gestion de la relation client (CRM) et de gestion des ressources de l’entreprise (ERP) représenteront plus de 60% de toutes les applications cloud dépensées jusqu’en 2021. La variété des applications livrées via SaaS est énorme, du CRM tel que Salesforce à Microsoft 365. Découvrez notre article « Hébergement des applications sur le Cloud : pourquoi et comment ? » sur le même sujet.

Are you a company? Protect yourself at cloud

Vous souhaitez aller plus loin ? Parcourez notre article « Edge computing et Cybersécurité : attention aux risques »

Want to go one step further and put SaaS, PaaS and IaaS to work for your organization?