What are the service models of cloud computing?

The service models of cloud computing include: 1. Infrastructure as a service; 2. Platform as a service; 3. Software as a service. The main function of platform as a service is to provide a development and operation platform as a service to users; the main function 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 also called Hardware-as-a-Service. A few years ago, if you wanted to run some enterprise applications in your office or company website, you needed to buy a server. , or other expensive hardware to control local applications and let your business run.

But now with IaaS, you can outsource the hardware to other places. IaaS companies will provide off-site servers, storage and network hardware that you can rent. Saving maintenance costs and office space, companies can leverage the 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. For example, Amazon and Microsoft not only provide you with IaaS, they will also Computing power is rented to you to host your website.

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

The second layer is the so-called PaaS, sometimes also called middleware. All your company's development can be performed on this layer, saving time and resources.

PaaS companies provide various solutions for developing and distributing applications online, such as virtual servers and operating systems. This saves you money on hardware and makes collaboration between dispersed studios easier. Web application management, application design, application virtual hosting, storage, security and application development collaboration tools, etc.

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

SaaS: Software-as-a-Service

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

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

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

Comparison between Iaas and Paas

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

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