SaaS, or Software as a Service, is a model of delivering software applications over the internet, allowing users to access and use the software without the need for installation or maintenance on their own devices. This cloud-based approach offers a convenient and cost-effective solution for businesses and individuals, as it eliminates the need for purchasing and managing physical software licenses. With SaaS, users can simply log in to the software through a web browser and access all the features and updates in real-time, making it a flexible and scalable option for modern technology needs.