SaaS stands for Software-as-a-Service, which is a completely innovative software application model that emerged with the development of Internet technology and the maturity of application software at the beginning of the 21st century. It shares similar meanings with "on-demand software," application service provider (ASP), and hosted software. SaaS is a model of delivering software over the Internet, where vendors deploy application software on their own servers. Customers can subscribe to the required application software services from vendors based on their actual needs through the Internet. They pay fees to vendors based on the quantity and duration of the subscribed services and access the services provided by the vendors via the Internet. Users no longer need to purchase software but instead rent web-based software from providers to manage business activities. They do not need to maintain the software, as the service provider will fully manage and maintain it. Additionally, while offering internet-based applications to customers, software vendors also provide offline operation of the software and local data storage, enabling users to access the subscribed software and services anytime and anywhere. For many small businesses, SaaS is the best way to adopt advanced technology, as it eliminates the need for businesses to purchase, build, and maintain infrastructure and applications.