1. Infrastructure as a Service (IaaS)
2. Platform as a Service (PaaS)
3. Software as a Service (SaaS)
4. Function as a Service (FaaS)

Infrastructure as a Service (Iaas) is a cloud computing model that provides virtualized computing resources over the internet. It provides scalable and on-demand access to essential IT components such as Virtual Machines (VMs) Storage, and networking resources without the need to invest in hardware.

• Virtual Machines (VMs): emulate physical servers (for example Amazon EC2)
• Storage: (for example Amazon S3: Simple Storage Service)
  • Object storage
  • Block storage
  • File storage
• Networking:
  • Virtual Networks
  • Subnets
  • Load Balancers
  • VPN connections

Platform as a Service (PaaS) provides a platform allowing customers to develop, run, and manage applications without encountering the complexity of building and maintaining the underlying infrastructure.

In other words, PaaS offers a ready-made environment for developers to focus solely on coding and deploying applications rather than worrying about hardware provisioning, operating system updates, or network configuration.

PaaS platforms typically provide a range of development tools, middleware, and runtime environments and allow developers to choose the tools and technologies that best suit their needs. AWS Elastic Beanstalk:

    
* **Elastic Beanstalk:** Amazon Web Services (AWS) offers Elastic Beanstalk as a PaaS solution for deploying and managing web applications and services. With Elastic Beanstalk, developers can upload their application code, and AWS automatically handles the deployment, scaling, load balancing, and monitoring aspects, which simplifies the deployment process.