Cloud computing has three service models, iaaS, PaaS and SaaS. The corresponding Chinese explanations are "infrastructure as a service", "platform as a service" and "software as a service".
In addition to these three cloud computing service models, there is also a traditional non-cloud service model called on-premises.
First introduce these services separately:
On-premises: All operations basically do not depend on the outside world and are self-sufficient. That is, prepare the server by yourself, code by yourself, deploy the service by yourself, anyway, everything is done by yourself
Infrastructure services (iaas): The company does not need to worry about servers, storage, and networks in its operations, and directly uses the infrastructure of the cloud computing era. Such as Aliyun's ecs
The third is platform services (Paas): iaas only provides infrastructure, and paas is based on laas, adding an operating system and middleware. Take development as a chestnut to provide a good development environment for programmers, only need to boot , Open the development software, you can start development
The fourth is software service (Saas): you don’t need to prepare anything yourself, think about what you need, just use it directly
To summarize briefly:
iaas provides a blank server;
What paas provides is a platform, on this platform, what you want to make, freely play;
saas is a mature product developed and completed, such as office, wps, qq; if you need to use it, just use it directly, which is also the most exposed to the general public.
