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SaaS (Software as a Service) is originally referred as the Application Service Provider (ASP) model by the International Data Corporation (IDC) or it is sometimes called "'on-demand software"' which enables entities to access a complete business software functionality on a cloud based application.

The Software & Information Industry Association (SIIA) defines SaaS as an application or service deployed in a centralized data center across a network such as the Internet, Inranet, LAN or VPN.[1] Users maybe able to access the SaaS through subscription or by renting it from a vendor or service provider.

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