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What are the service models of cloud computing? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something.

The service models of cloud computing are: 1, infrastructure as a service; 2, platform as a service; 3, software as a service. The main role of platform as a service is to provide a development and running platform as a service to users; the main role of infrastructure as a service is to provide virtual machines as a service to users.

Three service models of cloud computing:

IaaS: Infrastructure-as-a-Service (Infrastructure as a Service)

The first layer is called IaaS, sometimes called Hardware-as-a-Service. A few years ago, if you wanted to run some enterprise applications on the office or the company's website, you needed to buy a server or other expensive hardware to control the local applications and get your business running.

But now that there is IaaS, you can outsource the hardware somewhere else. IaaS will provide off-site servers, storage and network hardware that you can rent. Saving maintenance costs and office space, companies can use this hardware to run their applications at any time.

Some big IaaS companies include Amazon, Microsoft, VMWare, Rackspace and Red Hat. However, these companies have their own expertise, such as Amazon and Microsoft not only provide you with IaaS, they will also rent their computing power to you to host your website.

PaaS: Platform-as-a-Service (platform as a Service)

The second layer is the so-called PaaS, which is sometimes called middleware. All the development of your company can be carried out at this level, saving time and resources.

PaaS provides a variety of solutions for developing and distributing applications, such as virtual servers and operating systems, online. This saves you money on hardware and makes it easier to collaborate between distributed studios. Web application management, application design, application hosting, storage, security and application development collaboration tools.

Some of the big PaaS providers have Google App Engine,Microsoft Azure,Force.com,Heroku,Engine Yard. Recent emerging companies include AppFog, Mendix and Standing Cloud

SaaS: Software-as-a-Service (Software as a Service)

The third layer is also called SaaS. This layer is the one that comes into contact with your life every day, mostly through a web browser. Any application on a remote server can be run over the network, which is called SaaS.

The services you consume enter these categories entirely from web pages such as Netflix, MOG, Google Apps, Box.net, Dropbox or Apple's iCloud. Although these web services are used for business and entertainment or both, they are also part of cloud technology.

Some SaaS applications used for business include Citrix's GoToMeeting,Cisco, WebEx,Salesforce 's CRM,ADP,Workday and SuccessFactors.

Comparison between Iaas and Paas

The main role of PaaS is to provide a development and running platform as a service to users, while the main role of IaaS is to provide virtual machines or other resources to users as services.

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