What is SaaS? Software as a Service | Microsoft Azure
https://azure.microsoft.com/en-us/resources/cloud-computing-dictionary/what-is-saas/
WebSoftware as a service (SaaS) allows users to connect to and use cloud-based apps over the Internet. Common examples are email, calendaring, and office tools (such as Microsoft Office 365). SaaS provides a complete software solution that you purchase on a pay-as-you-go basis from a cloud service provider .
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