A cloud service model specifies the services and the capabilities that are provided to the consumers.
- Infrastructure as a Service (IaaS)
The capability provided to the consumer is to provision processing, storage, networks, and other fundamental computing resources where the consumer can deploy and run arbitrary software, which can include operating systems and applications. The consumer does not manage or control the underlying cloud infrastructure but has control over operating systems, storage, deployed applications, and possibly limited control of select networking components.
- Example: Amazon EC2, S3
- Pricing: subscription-based or resource usage

- Platform as a Service (PaaS)
The capability provided to consumers is to deploy onto the cloud infrastructure consumer-created or acquired applications created using programming languages, libraries, services, and tools supported by the provider. The consumer does not manage or control the underlying cloud infrastructure including network, servers, operating systems, or storage, but has control over the deployed applications and possibly configuration settings for the application-hosting environment configurations.
- Example: Google App Engine, AWS Elastic Beanstalk, Microsoft Azure
- Pricing: calculated based on factors such as the number of consumers, the types of consumers, the for which the platform is in use, and the compute, storage, or network resources consumed by the platform.

- Software as a Service (SaaS)
The capability provided to the consumer is to use the provider’s applications running on a cloud infrastructure. The applications are accessible from various client devices through either a thin-client interface such as a web browser or a program interface. The consumer does not manage or control the underlying cloud infrastructure including network, servers, operating systems, storage, or even individual application capabilities, except for limited user-specific application configuration settings.
- Example: Google Apps, Microsoft Office 365
- Pricing: calculated based on factors such as the number of consumers, the types of consumers, the for which the platform is in use, and the compute, storage, or network resources consumed by the platform.

- Everything as a Service
Everything as a service originated as software as a service and has since expanded to include services such as infrastructure as service, platform as service, storage as service, desktop as service, and disaster recovery as service.
- Example: Transportation as a service is being fulfilled by companies like Uber. Grocery as a service is being offered by chains such as Safeway and Amazon’s Whole Foods