Software as a service (SaaS) sometimes referred to as "on-demand software," is a software delivery model in which software and its associated data are hosted centrally (typically in the (Internet cloud) and are typically accessed by users using a thin client, normally using a web browser over the Internet.
Most of the web based applications we use like gmail, yahoomail belong to SaaS group. All business enterprises providing services like CRM, accounting, marketing over the internet are switching over to SaaS type of model.
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