Software as a Service (SaaS) is a cloud-based software delivery model where software applications are delivered over the internet as a service. Instead of purchasing and installing software on local computers or servers, users can access the software through a web browser or mobile app, paying a subscription fee for ongoing access to the software.

SaaS solutions can be used for a range of business functions, including customer relationship management, project management, accounting, marketing automation, and more. SaaS solutions are typically hosted and managed by the software provider, allowing businesses to focus on using the software rather than managing the underlying infrastructure.