SaaS (Software-as-a-Service)
Translated as "software as a service." In this model, the service provider uses its own Internet application and allows consumers to use it over the World Wide Web. Key features of SaaS:
- Service users do not pay for updates, installation, or maintenance of used hardware and software.
- Service improvement and updates are performed transparently for users—they do not need to manually perform any actions for this.
- The provider charges a fee for using the service. The price is determined by the duration of access (e.g., per month) or the volume of operations performed.
PaaS (Platform-as-a-Service)
Translated as "platform as a service." In this model, the provider invites customers to use its cloud infrastructure to install their own software. This includes entire platforms: OS, DBMS, and various development tools. Key features of PaaS:
- Only the provider has access to manage the PaaS cloud infrastructure. It also defines the set of available platforms, settings, and services.
- The cost is determined by the volume of services provided, which can be measured by usage time, number of transactions, traffic, and other factors.
IaaS (Infrastructure-as-a-Service)
Translated as "infrastructure as a service." Unlike the first two models, this one offers greater freedom—the consumer can personally manage the provided services. These may include tools for managing and controlling various resources.
DaaS (Desktop-as-a-Service)
The DaaS model is a logical extension of SaaS. Here, the service is not specific software but a ready-to-use workplace equipped with all necessary tools. The 3data data center network uses this service model, as it is the most modern and scalable.
In short, any of the above services is designed to reduce time and financial costs for deploying and supporting your IT service (whether it's a business card website, a 1C server in the cloud, or a large corporate project). The difference lies in which part of the responsibilities you retain and which you delegate to the service provider.
We hope this material has helped you understand the variety of "as a service" models.