If you’re just starting to explore the concept of SaaS, this is the place to find out what SaaS can do for you, see how SaaS is different, identify questions about SaaS, and learn more about developing SaaS applications.

Software as a service (or SaaS; pronounced /sæs/) is a way of delivering centrally hosted applications over the Internet—as a service. 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.

Instead of installing and maintaining software, you simply access it via the Internet, freeing yourself from complex software and hardware management. The provider manages access to the application, including security, availability, and performance. SaaS business applications are usually accessed by users using a thin client via a web browser.

  • High adoption
  • Lower initial costs
  • Painless upgrades
  • Seamless integration

SaaS facilitates remote application hosting and delivery, making this the key advantage of SaaS: painless application access. SaaS customers have no hardware or software to buy, install, maintain, or update. Access to applications is easy—you just need an Internet connection.

A good way to understand the SaaS model is by thinking of a bank, which protects the privacy of each customer while providing service that is reliable and secure—on a massive scale. A bank’s customers all use the same financial systems and technology without worrying about anyone accessing their personal information without authorization.

A “bank” meets the key characteristics of the SaaS model:

A multitenant architecture, in which all users and applications share a single, common infrastructure and code base that is centrally maintained. Because SaaS vendor clients are all on the same infrastructure and code base, vendors can innovate more quickly and save the valuable development time previously spent on maintaining numerous versions of outdated code.
The ability for each user to easily customize applications to fit their business processes without affecting the common infrastructure. Because of the way SaaS is architected, these customizations are unique to each company or user and are always preserved through upgrades. That means SaaS providers can make upgrades more often, with less customer risk and much lower adoption cost.
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