Cloud computing doesn't necessarily have to change the structure of your app. The main benefit of cloud computing in a lot of cases is scaling.
Right now if your iPhone apps become really popular and overload your current host, what do you do?
Using the cloud, you could spin up new instances (servers) on demand almost instantly. Another benefit is you only pay for what you need. Of course, depending on the situation, it might require changes to your structure to take advantage of scaling features.
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云计算不一定要改变应用程序的结构。在很多情况下，云计算的主要好处是可扩展性。
现在，如果您的 iPhone 应用程序变得非常流行并且使您当前的主机超载，您会怎么做？
使用云，您几乎可以立即按需启动新实例（服务器）。另一个好处是您只需支付您需要的费用。当然，根据情况，可能需要更改结构才能利用扩展功能。
编辑：特定于 AWS，他们有一项名为 Elastic Load Balancing 的服务。看一下：http://aws.amazon.com/elasticloadbalancing/
Cloud computing doesn't necessarily have to change the structure of your app. The main benefit of cloud computing in a lot of cases is scaling.
Right now if your iPhone apps become really popular and overload your current host, what do you do?
Using the cloud, you could spin up new instances (servers) on demand almost instantly. Another benefit is you only pay for what you need. Of course, depending on the situation, it might require changes to your structure to take advantage of scaling features.
edit: Specific to AWS, they have a service called Elastic Load Balancing. Take a look: http://aws.amazon.com/elasticloadbalancing/