SaaS

Software as a service (SaaS, typically pronounced 'Sass') is a model of software deployment where an application

is hosted as a service provided to customers across the Internet.  By eliminating the need to install and run

the application on the customer's own computer, SaaS alleviates the customer's burden of software maintenance, 

ongoing operation, and support.  Using SaaS also can reduce the up-front expense of software purchases,

through less costly, on-demand pricing.  From the software vendor's standpoint, SaaS has the attraction of 

providing stronger protection of its intellectual property and establishing an ongoing revenue stream.  

The SaaS software vendor may host the application on its own web server, or this function may be handled by a

third-party application service provider (ASP).

Philosophy of SaaS

As a term, SaaS is generally associated with business software and is typically thought of as a low-cost way for businesses to obtain the same benefits of commercially licensed, internally operated software without the associated complexity and high initial cost.  Consumer-oriented web-native software is generally known as Web 2.0 and not as SaaS.  Many types of software are well suited to the SaaS model, where customers may have little interest or capability in software deployment, but do have substantial computing needs.  Application areas such as Customer Relationship Management, Videoconferencing, Human Resources, IT Service Management, Accounting and e-mail are just a few of the initial markets showing SaaS success.  The distinction between SaaS and earlier applications delivered over the Internet is that SaaS solutions were developed specifically to leverage web technologies such as the browser, thereby making them web-native.

Key characteristics of software delivered by SaaS

The key characteristics of SaaS software include:

• Network-based access to, and management of, commercially available software.

• Activities are managed from central locations rather than at each customer's site, enabling customers to access applications remotely via the Web.

• Application delivery that typically is closer to a one-to-many model (single instance, multi-tenant architecture) than to a one-to-one model, including architecture, pricing, partnering, and management characteristics.

• Centralized feature updating, which obviates the need for downloadable patches and upgrades.