SaaS  in a nutshell

Software as a service (SaaS) is a digital distribution web-based model in which a vendor develops and hosts applications and makes them available to clients over the Internet.

At the Software as a service (SaaS) model of operation the user actually “rents” the software and pays for the authorization to use it for a certain period of time. With the traditional model of operation, the user must build the server, install the application and configure it. Via SaaS, all kinds of data are accessible from any device with an Internet connection and web browser. That is the main reason which SaaS has started to gain the trust of Directors and especially healthcare providers.

Read more at this article 10 reasons why SaaS is good for business