One of the most popular forms of cloud computing is software as a service (SaaS). It is one of the three major categories of cloud computing, along with infrastructure as a service (IaaS) and platform as a service (PaaS). SaaS has become the dominant software delivery model since the concept debuted in the early 2000s.
SaaS stands for software as a service, which means software is hosted by a third-party provider and delivered to customers over the internet as a service. While most SaaS products are aimed at business users, some products have proved popular with individual consumers, like note-taking app Evernote or personal finance tools like TurboTax and Mint.