SaaS (Software-as-a-service) means that software as a service, SaaS Chinese name for the software business or software operations. SaaS is a web-based software applications to provide software services model. As a rise in the 21st century model of innovative software applications, SaaS is the latest trend in software development.

SaaS provider to enterprises to build all the necessary information network infrastructure and software, hardware, operating platform, and is responsible for all pre-implementation, maintenance and other services later, enterprises need to purchase hardware and software, building the engine room, recruitment of IT staff information systems can be used through the Internet. Tap water can be just as open as, according to the actual needs of enterprises, from the SaaS provider of leasing software services.

SaaS is a software distribution model, its application specifically designed for network delivery, user through the Internet hosting, deployment and access. SaaS applications are often priced as a "package" costs, include the usual software license fees, software maintenance fees and technical support costs, its unified monthly rental charges for each user. For the majority of small and medium enterprises, SaaS is the use of advanced technology, the best way to implement information technology. But SaaS will not only apply to small and medium enterprises, enterprises of all sizes can benefit from SaaS.

By 2008, IDC will be composed of SaaS into two categories: hosted application management (hosted AM) - formerly known as application service provider (ASP), and "on-demand software," that is synonymous with SaaS.From 2009 onwards, hosted application management, application outsourcing has been used as part of a plan IDC, and on-demand software and SaaS delivery model is considered the same treatment.

Currently, SaaS has become an important force in the software industry. As long as the quality and reliability of SaaS will continue to be confirmed, and its charm will not fade.