Software as a Service (SaaS) transforms software distribution by delivering applications through cloud computing. Instead of traditional installation methods, users access software via the internet, typically through subscription models, which enhances accessibility and reduces hardware dependencies. This model enables real-time updates and maintenance by the service provider, minimizing downtime for users. SaaS also supports scalability, allowing businesses to adjust their subscriptions based on changing needs. Overall, this shift improves cost-efficiency and fosters collaboration, as users can access applications from various devices seamlessly.