What is Software as a Service (SaaS)?

Software as a Service (SaaS) is characterized by its delivery model, where software is hosted centrally on the Internet and is made available to users via a web browser. This eliminates the need for users to install the software locally on their devices, as they can access it from anywhere with an internet connection. This model offers advantages such as automatic updates, scalability, and cost-effectiveness, allowing users to pay for what they need without the overhead of maintaining local installations.

Other options describe scenarios that do not align with SaaS. Software installed locally on users' devices pertains more to traditional software models, which require installation and maintenance on each individual machine. Requiring in-depth technical knowledge typically relates to software setups that are complex and need advanced skills, which is contrary to the user-friendly nature of SaaS. Lastly, stating that software cannot be accessed remotely goes against the fundamental principle of SaaS, as its primary benefit lies in its accessibility from various locations through the Internet.