A cloud-based software delivery model where applications are hosted by a service provider and accessed by users over the internet. Rather than purchasing and installing software on individual devices, users subscribe to the service and access it via a web browser or app. SaaS offers several advantages, including scalability, automatic updates, and reduced infrastructure costs. Users typically pay a recurring subscription fee, which can be based on factors such as usage, number of users, or feature tiers. This model allows for flexibility, ease of maintenance, and the ability to access the software from anywhere with an internet connection.