SaaS, or Software as a Service, is a cloud-based software delivery model where applications are hosted on the internet and accessed via a web browser. This eliminates the need for users to install and maintain software on their local devices, making it easier to use and manage. With SaaS, users typically pay a subscription fee, which can be monthly or annually. This model allows for automatic updates and scalability, enabling businesses to adjust their software needs as they grow. Popular examples of SaaS include Google Workspace and Salesforce.