我好奇故我在

(source: http://www.physorg.com/news159011833.html)

這一篇解釋雲端運算很清楚明白，雲端運算可以讓公司行號「在需要時」買「想要的服務」，譬如銷售有淡旺季，可以在旺季時買所需要的服務，如以下服務：

• business processing (advertising, e-commerce and payments processing) software-as-a-service

• systems infrastructure (storage and backup services

好處是剛開始的公司不需要在硬體設備花大錢，而是隨使用量花錢就好；也可以說這樣的彈性方式讓跨入經營的門檻降低。

而現代科技的監控技術也可以讓企業放心，如果跟Amazon買服務，如果它的主機當了，技術會自動找另一台主機代替。

Cloud computing refers to a distribution-and-pricing model in which companies can purchase services such as software, bandwidth, server space and web applications over the Internet on an on-demand basis. For example, a retailer needing a little extra computing power during holiday shopping season can rent out additional server space from “clouds” like Amazon Web Services for that period.

One of the important benefits [of cloud computing] is that the resources scale up and down in a flexible manner. If a company has major peaks and valleys in their usage, they are able to accommodate the peaks without paying for full, peak capacity all the time. They only pay for what they use, and they get the benefit of never being out of capacity.
* capacity the maximum amount