Software as a service is a software licensing and delivery model in which software is licensed on a subscription basis and is centrally hosted. It is sometimes referred to as on-demand software and was formerly referred to as software plus services, SaaS is typically accessed by users using a thin client via a web browser.
Hardware and software maintenance services. Maintenance services include both hardware maintenance and support services, and network software maintenance and support services. ... Software maintenance and support services include long-term and pay-as-you-go (incident-based) support contracts.