There are three main service models for cloud computing: infrastructure as a service (IaaS: Infrastructureaservice) platform as a service (Paas: Platformasaservice) software as a service (SaaS: SoftwareasaService) infrastructure as a service (IaaS) IaaS. Infrastructure as a Service. Provides pay-as-you-go computing resources such as servers, networks, disk storage, and data centers. Examples include AWS, MicrosoftAzure, AliCloud, and you can buy cloud storage. Platform as a Service (PaaS) PaaS, cloud service platform. Provides hardware and software tools that make it easier for developers to quickly create web or mobile applications. Examples include windowsazure, Heroku. software as a service (SaaS) SaaS, cloud-based applications that are granted access to businesses or individuals over the web. For example, Baidu cloud disk (personal SaaS), nail (enterprise SaaS), 53KF customer service system (enterprise SaaS). difference between IaaS, PaaS, SaaS? Here's a list of building a house. Three fathers, respectively called IaaS, PaaS and SaaS, said to their sons:IaaS: give you a place to build a house, you make your own materials, find someone to build.PaaS: give you a place to build a house, brick cement sand is also complete, you find your own people to build.SaaS: the house is rented to you, you can move directly into it.IaaS: give you a place to build a house, brick, cement sand is also complete, you find someone to build.PaaS: give you a place to build a house, brick, cement sand is also complete, you find someone to build. Network (networking), storage (storage), servers (servers), virtualization (virtualization), operating system (O/S), middleware (middleware), memory management (runtime), data (date), applications (applications) in short IaaS can be seen as the infrastructure for building applications, PaaS can be seen as the platform for developers to build applications, and SaaS can be used directly to directly fulfill the business needs of an organization. In the end essentially, each cloud service model is a certain level of resource abstraction and is offered as a service to businesses, organizations or individuals. At the same time, businesses, organizations and individuals can adopt different cloud service models depending on their circumstances. However, in any case, cloud service models simplify development to varying degrees and allow businesses, organizations and individuals to focus more on their business and business development.