Software as a service (or SaaS) is a way of delivering 
applications over the Internet—as a service. 
Instead of installing and maintaining software, 
you simply access it via the Internet, freeing yourself 
from complex software and hardware management.

SaaS applications are sometimes called Web-based software, 
on-demand software, or hosted software. Whatever the name, 
SaaS applications run on a SaaS provider’s servers. 
The provider manages access to the application, 
including security, availability, and performance.