Web application, SAAS?

I am trying to uncover "What is truly SAAS." This software is a service, and outlook hotmail is one example of SAAS. But I'm still confused. Suppose I created a hospital management system web application that stores a record of an entire patient and all that, whether it is software as a service. What specific things are needed to be Software as a service, or just a web application is SAAS ????

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Software is SAAS if it is deployed and managed to serve multiple users (tenant is the term here) from the same deployment. This means that the software is not deployed on the client side, and it does not have to be for every tenant.

Your hospital management systems will be SAAS if you deploy them in your infrastructure, and several hospitals use them as if you created them for each of them.

Here are some links to help you better understand.

Databse architecture (separate db vs client specific db) for the Building Enterprise Web (RIA) application in the cloud

Tenant Load Balancing Explanation in Level 4 SaaS Maturity Model

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