As you know, Cloud Computing is concerned with the mechanism of using a network of remote servers hosted on the Internet to store, manage, and process data, rather than a local server or a personal computer. Meanwhile, Cloud Computing Services are generally classified into three broad categories: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (Saas). In short, IAAS tends to deliver computing infrastructure as on-demand services, PAAS is a cloud delivery model for applications composed of services managed by the third party, and SaaS is a way of delivering services and applications over the Internet. These are like the fundamentals of Cloud Computing and in this video, we're going to discuss each of these models in detail with the help of various interesting real-world examples. 

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https://www.geeksforgeeks.org/cloud-based-services/ 

https://www.geeksforgeeks.org/difference-between-iaas-paas-and-saas/