Within each cloud computing deployment models, there are three main types of cloud computing services: Infrastructure as a Service (IaaS), Platform as a Service (Paas), and Software as a Service (SaaS).
Infrastructure as a Service (IaaS)
IaaS provides on-demand infrastructure resources, such as compute, storage, networking, and virtualisation. The customers are responsible for managing and maintaining their software stack, such as operating systems, middleware, runtime environment, data, and application.
Platform as a Service (PaaS)
PaasS provides a platform for developers to build, deploy, and manage applications. Developers can focus solely on writing code and not worry about the infrastructure, operating system, and environment for running their applications. PaaS often includes tools, libraries, and cloud databases for application development, testing, and deployment.
Software as a Service (SaaS)
SaaS provides a full software application stack to the customer over the internet. SaaS solutions often come as ready-to-use applications, which are managed and maintained by the cloud service provider.
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Reference - What are the different types of cloud computing?