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IaaS, Infrastructure as a Service

It is one of the three fundamental models in the field of cloud computing, together with the Platform as a Service (PaaS, Platform as a Service) and the Software as a Service (SaaS, Software as a Service). Like all cloud services, the IaaS offered by Servidores del Sur provides access to computing resources located in a virtualized environment, the “cloud”.

In the case of IaaS, the computing resources offered consist, in particular, of virtualized hardware, or, in other words, processing infrastructure. The definition of IaaS covers aspects such as storage space on virtual servers, processors, memory, network connections, bandwidth, IP addresses, firewalls, and load balancers among other things. Physically, the repertoire of available hardware resources comes from a multitude of servers and networks, generally distributed among numerous data centers, which are maintained by the cloud service provider. The customer, for his part, gets access to the virtualized components to build his own computing platform with them.

The IaaS model coincides with the other two cloud hosting modalities in that it can be used by business customers to create affordable and easy-to-scale IT solutions, in which all the complexity and cost associated with managing the underlying hardware is outsourced to the cloud service provider. If the scale or volume of the customer’s business fluctuates, or if the company plans to grow, it can turn to the cloud when and how it needs it, instead of having to purchase, install and integrate hardware on your own.

SaaS, Software as a Service

The concept of Software as a Service (SaaS, Software as a Service) describes any cloud service in which consumers can access software applications over the internet. These applications are hosted “in the cloud” and can be used for a wide variety of tasks, both for individuals and organizations. Business users can use applications to solve a wide range of needs, from accounting and billing to sales tracking, planning, performance monitoring and communications (for example, webmail and instant messaging)

The SaaS model is also sometimes referred to as “software on demand,” and the way you use it is more like renting the software than buying it. With traditional applications, the software is initially purchased as a package, and once purchased it is installed on the user’s computer. The software license may also establish limitations on the number of users and / or devices on which it can be installed. Rather, Software as a Service users subscribe to, rather than purchase, the software, usually on a monthly basis. Applications are purchased and used over the internet, and files are stored in the cloud, not on the user’s computer.


  • There are no hardware investment costs.
  • There is no registration fee. Applications are ready to use as soon as you subscribe.
  • You pay only for what you use. If a piece of software is only going to be needed for a limited period, it can only be paid for during that period, and subscriptions can generally be canceled at any time.
  • The use of the service is scalable. If a user decides that they need more storage space or contract additional services, for example, they can access those services on demand without having to install more hardware or software .
  • Updates are automatic. Every time there is an update, it is immediately available online to users, often at no cost.
  • Compatibility between devices. Any device with an internet connection can be used to access SaaS applications.
  • Accessible from anywhere. Rather than being limited to specific installations on specific computers, the application can be accessible to anyone with a device capable of connecting to the internet.
  • Applications can be customized and associated with the provider’s brand image. Some software applications can be customized, that is, altered to suit the needs and brand image of a particular customer.

PaaS, Plataform as a Service

The concept of Platform as a Service is a category of cloud services that provides a platform and an environment that allow developers to create applications and services that work through the internet. PaaS services are hosted in the cloud, and users can simply access them through their web browser or remote desktop.

PaaS services consist of preconfigured functionalities that customers can subscribe to, choosing the functions they want to include to solve their needs and discarding those they do not need.

Thus, the packages can vary from a simple environment that is managed with the mouse and does not require any type of knowledge or special installation on the user side, to the provision of infrastructure options for advanced development.

Infrastructure and applications are managed on behalf of the customer, and various levels of technical support are also offered. The services are constantly updated, improving existing functionalities and adding new ones. PaaS providers can collaborate with developers from the conception of their original ideas to the creation of the applications, even to the testing and implementation phases. And all of that is achieved using a single managed mechanism.

As in most cloud service proposals, PaaS services are usually billed as a subscription in which the customer ends up paying only for what they actually use. Additionally, you can benefit from the economies of scale that comes from sharing the same underlying physical infrastructure among many users, resulting in reduced costs.

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