First, cloud computing

1. What is cloud computing?

Cloud computing is a dynamic easily spread and is usually provided by the Internet virtualized computing resources , the user does not need to know the details of internal clouds, clouds do not have internal expertise, you can get only pay computing resources.

2. The goal of cloud computing?

（1）降低成本
（2）创造新价值
（3）用廉价硬件实现高性能计算
（4）按需付费
（5）绿色环保

3. The specific application cloud

（1）云杀毒
（2）云存储（百度网盘）
（3）百度地图导航（SaaS）
（4）腾讯云（qq 微信等）
（5）云教育
（6）云通讯
（7）云交通

4. Cloud chain

Three basic elements: user, network and cloud platform
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The evolution and development of cloud computing

（1）电厂模式阶段。 
（2）效用计算阶段。
（3）网格计算阶段。
（4）云计算阶段。

6. Cloud Computing Category

Public cloud : infrastructure cloud computing is a marketing services organization owned. The organization will cloud computing services for sale to the general public or the wider community.
Private cloud : The cloud infrastructure is owned or leased by a single organization. The infrastructure is fully managed by the organization.
Hybrid cloud : infrastructure of private and public cloud composition, each cloud remained independent, but with a standard or proprietary technologies combine them with data and application portability.

Second, cloud services

1. types of cloud services

You can start to finish, produce their own pizza, but this is too much trouble, things need to be prepared and more, so you decide to outsource part of the work, using the service of others. You have three options.

Cloud Service Type - Option One: IaaS . Others provide a kitchen, stove, gas, you use these infrastructures to bake your pizza.
Cloud Service Type - Option Two: PaaS . Design pizza taste (seafood pizza or chicken pizza), others provide a platform service that allows you to design your own realization.
Cloud service types - Option Three: SaaS . Direct others to do the pizza, do not you intervene, the hand is a finished product. You have to do is sell it, up to then packaged, printed on your own Logo.