SaaS

SaaS (Software as a service)

It 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.
SaaS is a software delivery method that provides access to software and its functions remotely as a Web-based service.
Software as a Service allows organizations to access business functionality at a cost typically less than paying for licensed applications since SaaS pricing is based on a monthly fee.
Also, because the software is hosted remotely, users don't need to invest in additional hardware.
Software as a Service removes the need for organizations to handle the installation, set-up and often daily upkeep and maintenance.
Software as a Service may also be referred to as simply hosted applications.
SaaS can be implemented with local applications that expire after a certain time, but it is ideally suited for cloud computing in the Internet and Web browser-based applications, which can run in any desktop or mobile device, no matter the operating system.

In this model, the applications are maintained in the service provider's datacenter, and every time users launch their browsers and log on, they get the latest version. In addition, the data can also be stored in the provider's datacenter.