Software as a Service (SaaS) differs from traditional software in that it is delivered over the internet as a subscription service, eliminating the need for local installation and maintenance. Users access SaaS applications through web browsers, ensuring automatic updates and scalability without requiring dedicated IT resources. This model enables organizations to reduce upfront costs, as they pay only for what they use. In contrast, traditional software usually involves purchasing licenses and managing infrastructure, resulting in higher initial investments and ongoing maintenance responsibilities.