Software as a Service/Software on Demand — is one of the cloud computing service models alongside Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Desktop as a Service. Saas is a business model that distributes a licensed, ready-to-use software hosted by a third-party provider. This software delivery method enables the access to various business applications via the Internet. Thus the application served out in a cloud infrastructure can be available from different client devices, either with the aid of a thin client interface or a program interface.
SaaS excludes the necessity for customers to install software applications on their computers and maintain them on their own. Furthermore, SaaS gives an opportunity to reduce expenditures for hardware acquiring and support, and also for software authorization and installment.
By using SaaS clients neither pay licence fees nor obtain the software. They pay for the rental of software, this fact makes possible the elimination of extra costs and expenditures for applications’ acquisition. If the need for the software is temporarily disappeared, a customer can easily stop using it and suspend payments to software publisher and provider.
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