Cloud computing is the practice of using remote hosted services delivered over the Internet. These services are divided into three main categories:
Infrastructure as a service (IaaS).
Platform as a Service (PaaS).
Software as a Service (SaaS).
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Infrastructure as a Service (IaaS) is a cloud computing business model that offers IT infrastructure like compute, storage, and network resources on a pay-as-you-go basis over the internet.
You as an Individual, business or government can use IaaS to request and configure the resources you require to run your applications and IT systems. This gives you flexibility and control over your IT resources in a cost-effective manner.
Platform as a service (PaaS) is a type of cloud computing service model where subscribers are allowed to easily create, test, run, and deploy software and web applications without the complexity of building and maintaining the infrastructure associated with developing and launching the applications.
In PaaS the service provider, provides and manages the infrastructure which includes (servers, storage, and networking) and platform (middleware, development tools, database management systems, business intelligence, and more) to support the application life cycle. You as a subscriber only manage the application and data.
Software-as-a-Service, is a cloud-based computing model that provides software to users on pay as you use basis. Instead of installing and maintaining software, you simply access it via the Internet, freeing yourself from complex software and hardware installation and management.
The responsibility of Installing and Managing the entire software and hardware lies with the cloud service provider.