Cloud services are divided into three levels. The lowest level is infrastructure-based, the middle level is platform-based, and the upper level is software-based. These three levels are overlapped by the two cloud services Monitoring-as-a-Service (MaaS) and Security-as-a-Service
(SaaS). Monitoring-as-a-Service can be bundled as a management and monitoring service with other cloud services such as Platform-as-a-Service (PaaS), Infrastructure-as-a-Service (IaaS), and Software-as-a-Service
(SaaS).MaaS thus complements the company's own business model and contributes to cost reduction in cloud computing.