The difference between PAAS, IAAS and SAAS

I saw SAAS when browsing job postings, but I don’t know what it means? At work, a colleague also said that his girlfriend made PAAS products. At that time, I was confused. So it’s important to understand the difference between these terms.

Users can obtain services from complete computer infrastructure through the Internet. This type of service can be called Infrastructure as a Service, which is commonly known as IAAS. The corresponding other two services are platform as a service and software as a service. Platforms and services provide complete or partial application development that users can access, which we usually call PAAS. Software and services provide complete ready-to-use applications, which we usually call SAAS. If we regard them as a hierarchical structure, then the first layer is naturally called IAAS, the second layer is PAAS, and the third layer is SAAS.

Well, let’s stop talking about it professionally. I think many friends still have a little understanding of it. Then let’s start talking humanly. Suppose, if, if you are a foodie and you like pizza very much, then this problem can be easily explained. How does a foodie eat pizza? There are roughly the following methods:

1. Make it yourself

Sorry, if making it yourself is really a hassle, you There are a lot of things to prepare, such as the dining table and pizza dough. . . . . Wait, as shown in the picture below:

2. Buy instant pizza and cook it yourself

You only need to buy the finished product from the pizza shop and bake it at home. Yes, eat at your own table. Unlike making it at home, you need a pizza supplier. As shown in the picture below:

3. Make a call and order pizza to be delivered to your home. Just make a phone call and the pizza will be delivered to your doorstep. As shown in the picture below:

4. When eating pizza in a pizza shop, you don’t need to prepare anything, even the dining table belongs to the pizza shop. As shown in the picture below:

Okay, finally let’s summarize, can we eat pizza in several ways as shown in the picture below:

Now let’s go back to the cloud from pizza The concept of computing comes. Suppose you are a super awesome technology company that does not need services from others at all. You own infrastructure, applications and everything else. You divide them into three layers: infrastructure, platform and software. software), as shown below:

These are actually the three layers of cloud computing, with infrastructure at the bottom, platform in the middle, and software at the top, which are Infrastructure-as-a-Service (IAAS) , Platform-as-a-Service (PAAS), Software-as-a-Service (SAAS), and other "soft" layers can be added on top of these layers.

And your company has everything, and the current state it is in is called On-Premises, just like making pizza at home. If you want to run some enterprise applications in your office or company website, you need to buy a server or other expensive hardware to control local applications and allow your business to run. This is called local deployment. ?

What if you suddenly figure it out one day, just to eat pizza, why do you have to make it yourself? So, prepare to consider a cloud service provider. What services can this cloud service provider provide? ?The cloud services it can provide are the three layers of cloud computing: PAAS, IAAS and SAAS, just like a pizza shop provides three services: buying finished products to cook at home, takeaway and eating at the pizza shop. As shown below:

IAAS: Infrastructure-as-a-Service (Infrastructure as a Service), 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 large 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 also rent their computing power to you. 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 provides a variety of 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 large 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 (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 Go To Meeting, Cisco's WebEx, Salesforce's CRM, ADP, Workday, and SuccessFactors.