Database as a Service (DBaaS) delivers database functionality as an on-demand cloud service, masking complexity. It offers flexible, scalable, secure databases with self-service provisioning and consolidated resources. DBaaS provides advantages over traditional databases like lower costs, faster provisioning, and increased efficiency through standardization and automation. DBaaS can be implemented through virtualization or using Oracle's Grid Infrastructure and multitenant database features which provide high availability, scalability, and performance isolation through resource management. DBaaS offers a standardized platform that can be engineered once and used for multiple applications in a pay-as-you-grow model.