SaaS or Service as a Software is a method of delivering applications over the Internet as a service. It is one among the three main categories of cloud computing. The other two are IaaS (Infrastructure as a Service) and PaaS (Platform as a Service). With SaaS, you are saved from the hassle and expense of installing and maintaining software.
You can access it easily from the Internet instead, eliminating the need of having to manage complex software and hardware. Sometimes, SaaS applications are also known as on-demand software, hosted software, or web-based software. They run on the servers of a SaaS provider, who manages access to the application and looks after the issues of security, availability, and performance.
Some benefits of SaaS are easy customization, multitenant architecture, scalable usage, flexible payments, ease of accessibility, and automatic updates. Using APIs (Application Programming Interfaces), organizations can integrate SaaS applications with other software.