SaaS (Software as a Service) is a cloud-based delivery model where software applications are accessed over the internet rather than installed locally on computers. Businesses and individuals use SaaS to run essential programs - such as email, collaboration tools, or accounting software - directly through web browsers. This approach eliminates the need for complex installations, ongoing maintenance, or manual updates, as the service provider manages everything remotely. SaaS often integrates multiple apps, streamlining workflows and improving convenience for users. Popular examples include Google Workspace, Salesforce, and Microsoft 365.