There are predominantly three models of cloud service.
IaaS- Infrastructure as a Service (IaaS) consists of highly automated compute resources.It is highly scalable and can assist in quickly accessing and monitoring computers, database storage, and other networking services.
PaaS-Platform as a Service (PaaS) is helpful in customizing applications that require cloud components. It helps in streamlining the workflow in situations that involve more than one developer.
SaaS- Software as a Service (SaaS) refers to the service model where applications are delivered to the user using cloud platforms, and the third party can then manage the applications.