There are several cloud computing models that define the way cloud services are delivered and accessed. The main types of cloud models are:

1. Infrastructure as a Service (IaaS): Provides virtualized computing resources over the internet, including virtual machines, storage, and networking. Users have control over the operating system, applications, and some networking components.

2. Platform as a Service (PaaS): Offers a platform that includes not only infrastructure but also development tools, databases, and other resources to facilitate application development and deployment. Users focus on building and deploying applications without managing the underlying infrastructure.

3. Software as a Service (SaaS): Delivers software applications over the internet on a subscription basis. Users access the software through a web browser without worrying about installation, maintenance, or infrastructure management.

4. Function as a Service (FaaS) or Serverless Computing: Allows developers to deploy individual functions or pieces of code without managing the infrastructure. The cloud provider automatically handles the execution and scaling of functions in response to events.

5. Storage as a Service (STaaS): Provides cloud-based storage services, allowing users to store and retrieve data over the internet. It eliminates the need for physical storage infrastructure and offers scalable storage solutions.

6. Database as a Service (DBaaS): Delivers database services over the cloud, including database management, maintenance, and scaling. Users can access and manage databases without dealing with the underlying hardware.

These cloud models cater to different needs and preferences, providing flexibility and scalability for users with varying requirements.