PaaS (Platform as a Service) . CLOUD COMPUTING: BASIC CONCEPTS IaaS (Infrastructure as a Service) . Explore the core concepts of cloud computing and how it can help your business. For a start, cloud computing is not a technology but a model of provision and marketing IT services that meet certain characteristics. Cloud computing is the delivery of different services through the Internet. Presented as a service on the basis of the concept of cloud hosting. Is a service within the concept of cloud hosting. SaaS (Software as a service) .