The difference between cloud computing IaaS, PaaS, SaaS is?
First, what is Saas?
Saas English full Software-as-a-Service, Software as a Service. Use the software as easy to use as a service, rather than as a traditional PC software as installed on the computer before you can use to deploy.
Now, using a mobile phone App, web browser, pad and so on all kinds of access to the terminal, without having to install the software, as long as the network can use the features of the software. Broadly speaking, all the services, applications, network software can be used are all areas of Saas, such as the US group, micro-channel, Lynx, Alipay, headlines today, vibrato, Baidu browser, UC browser, and so on.
But SaaS on our talk today is not to be generalized, but the business services industry in SaaS. Business services in the SaaS refers to corporate customers as long as there is a network, you can get and enjoy the software features and services through a web browser, app such as Internet access terminal to obtain service to SaaS vendors.
Second, how SaaS model to make money?
If you open a company, do SaaS products, how to make money in the end it?
Let's put this child will know the universal formula:
Sales = sell commodities to the number of goods sold *
Applications in SaaS product, it is
= Customer unit sales number of customers *
But in fact, a long line to see, from the user acquisition costs, revenue growth point of view, the latter is more of a chip. For example:
SaaS real charm and power lies: renewal rate.
Q If the company added an amount the customer does not increase annually, the 5-year period, the company's revenue increased from 10,000,000 to 30,660,000, turned around three times. And if there is no renewal rate, new customer growth year on year is not, for example, on an annual increase of 100 customers, the company's revenue in five years and five years ago, this model is clearly money to be much more vulnerable.
So SaaS can evolve into money-making formula:
Annual sales of new customers this year = number of customer price + customers as of last year the cumulative total renewal rate * customer unit.
If you want to send large new customers to do, you need to spend the cost of user acquisition, customer service, sales, marketing add-acquisition cost is not low.
To summarize, SaaS company's model to make money, the real key is that the rate of renewals
On the other hand understood as follows:
"Cloud" is actually a metaphor for the Internet, the "cloud computing" is actually use the internet to access applications running on remote storage or server, data, or services.
任何一个使用基于互联网的方法来计算，存储和开发的公司，都可以从技术上叫做从事云的公司。
那么从事这些云的公司也是有分层的哦，就跟撩妹也分不同层次一样。这些从事云服务的公司，就分成：
Iaas——基础设施即服务Infrastructure as a Servie
Paas—— 平台即服务Platform-as-a-Service
Saas —— 软件即服务Software-as-a-Service
咋一看感觉蒙蒙的，后面还撸一串英文。
不急，我们把撩妹分成三个层次，每个层次形象对于上面的服务，大家看了就会明白上面的意思了。
Iaas
基础设施即服务
假设，你想要约一个妹子出来，那正常是约妹子去吃吃饭、看看电影、唱唱歌来着，那么饭店、影院、KTV就是为你约会提供基础设置和服务的(简称IaaS服务)。
IaaS就是专门提供基础设施服务的公司，几年前如果你想在办公室或者公司的网站上运行一些应用(比如自己开发好的APP或是网络游戏)，你需要去买服务器，成本太高了。
但是现在有IaaS，你可以将硬件外包给这些专业的公司，这些公司会提供场外服务器，存储和网络硬件，你花钱租用就行。
这样就节省了维护成本和办公场地，并且你可以在任何时候利用这些硬件来运行其应用。
就跟约会一样，饭店、电影院、KTV把你约会需要的硬件设置布置好了给你用，你付钱就行。
国内比较出名的Iaas有：阿里云、腾讯云等，国外就更多了包括Amazon， Microsoft， VMWare， Rackspace和Red Hat。
Paas
平台即服务
懂得了IaaS是什么意思，那我们再来说说PaaS平台即服务，这个是啥意思?
大家有没有发现，现在出现一些撩妹培训班、约会方案策划师啥的，这些公司提供的服务就是在帮你做一系列约会撩妹解决方案的，从软硬件都帮你搞定，剩下的只需要你去约会就行。
同理PaaS是面向软件开发者(撩妹者)的服务，云计算平台提供硬件，OS，编程语言，开发库，部署工具(各种培训班、方案策划、软硬件等)，帮助软件开发者更快的开发软件服务，某些时候也叫做中间件。
Cloud service provider of software development and software development platform for cloud operations cloud operating environment (including basic universal service middleware, database, web services, message bus, etc.) as a service to the end user.
In other words, these PaaS service providers are developed based service platform, the main purpose is to allow you to concentrate focus on the development of the above application level, without the need for repetitive basis wasted on these things, do not worry developed after deployment issues.
PaaS cloud computing architecture platform is located in the intermediate layer, which is the SaaS upper layer, the lower layer is IaaS.
See here, I have not felt in front of the IaaS PaaS with some overlap, and right, he is actually more in-depth on IaaS provides a set of solutions combining software and hardware.
But he died too limiting, just like people give you a good appointment planning program, you have to go according to the script, not free to play.
PaaS more famous include: GAE (Google), Ali ACE, Baidu BAE, Sina SAE and so on.
Saas
Software as a Service
Finally SaaS model, it should be more readily understood this concept recently over the fire often hear, and many applications are developed based on the SaaS model.
Saas software as a service, it simply is what you want people to develop good functionality into applications software, and then sell directly to the account you use, you do not need to worry about servers, bandwidth, application development and other issues, pay directly to use on the line.
From tease sister perspective to understand is that now all kinds of a street, a close network, a large number of matchmaking agencies, they are the sister called up, then you can find your sister through the use of their platform or service, it is the same reason.
Of course, with pay not pay benefits obtained is not the same, empathy SaaS software services companies have to provide different levels of service.
Reference: http://www.woshipm.com/it/2268314.html
http://www.sohu.com/a/191366901_468730?qq-pf-to=pcqq.c2c