Software as a Service (SaaS) is a cloud-based software delivery model where applications are hosted on the internet and accessed via a web browser. Users subscribe to the software instead of purchasing it outright, allowing for easier updates and maintenance. This model is popular for its flexibility and scalability, making it suitable for businesses of all sizes. With SaaS, users can access their applications from any device with an internet connection, promoting collaboration and remote work. Examples of SaaS include Google Workspace, Salesforce, and Microsoft 365, which provide various tools for productivity, customer relationship management, and more.