Production running of existing applications (consider that migration requires true IaaS; PaaS alone may be insufficient)

现有应用程序的生产运行（请考虑迁移需要真正的 IaaS；只 PaaS 可能并不充分）

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Next, the consumer wants to know what security focus for user, resource, and data request threshold policy is for SaaS, PaaS and IaaS.

接下来，使用者希望了解SaaS、PaaS和IaaS用户、资源和数据请求安全策略的安全关注重点是什么。

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In other words, PaaS is IaaS with a custom software stack for the given application.

换句话说，PaaS就是IaaS加上一个用于给定应用的定制软件栈。

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Among tech companies, different strategies are emerging as some companies decide to be specialized niche players while a very small number of other tech vendors choose to play at one or more levels of the 3-tier cloud stack: applications (SaaS), platforms (PaaS), and infrastructure (IaaS).

FORBES: The Cloud Revolution and Creative Destruction

The cloud computing market consists of software as a service (SaaS), platform as a service (PaaS) and infrastructure as a service (IaaS).

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Infrastructure-as-a-service (IaaS) and platform-as-a-service (PaaS) leadership is going to determine the winner of the battle for dominance in the cloud.

FORBES: The Battle For The Cloud Is On -- Who Will Win?