Infrastructure as a Service (IaaS) Provide the basic building blocks of computer resources, computer hardware IaaS with traditional physical, such as servers, storage arrays, and connected network, and allows you to build a virtual infrastructure imitate these resources, but can be created, reconfigured, resized, and removed in the moment, and when a job requires it. IaaS providers most popular, Amazon Web Services, provides a range of options, including the "EC2" of computing platforms, and storage platforms, "S3". Platform as a service (PaaS) Activities in class on whether the computer hardware, physical or virtual, PaaS provides a method for the programming language for interacting with services such as databases, web servers, and file storage, without having to deal with the requirements subordinates how much space as an essential database, whether the data should be protected by making a copy between 3 servers, or distribute the workload on the server can be spread throughout the world. Typically, applications must be written for a specific PaaS provider to take full advantage of the service, and most of the platform only supports a limited set of programming languages. Typically, PaaS providers also have a software as a service provider (see below), and the platform was originally built to support specific software. Some examples of PaaS is the system solution "Google App Engine", "Heroku" system that operates on the Amazon Web Services IaaS, and "Force.com" was built as part of the software SalesForce.com is a service provider. Software as a service (SaaS) The top layer of cloud computing, software as a service is usually built on a platform as a service solutions, whether it is a public platform or not, and provides software for end users such as email, word processing, or a CRM business. Software as a service is usually charged on a per-user basis and each month, and the company has the flexibility to add or remove users at any time without additional external costs monthly fee per user. Some of the most popular SaaS solutions as "Google Apps", Salesforce.com, and Microsoft "Business Productivity Online Suite
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