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What are cloud service models?
PaaS, IaaS, and SaaS acronyms for the different cloud service models. These models define the different levels of shared responsibility that a cloud provider and cloud tenant are responsible for.
Model Definition Description
IaaS Infrastructure-as-a-Service
This cloud service model is the closest to managing physical servers; a cloud provider will keep the hardware up-to-date, but operating system maintenance and network configuration is up to you as the cloud tenant. For example, Azure virtual machines are fully operational virtual compute devices running in Microsoft datacenters. An advantage of this cloud service model is rapid deployment of new compute devices. Setting up a new virtual machine is considerably faster than procuring, installing, and configuring a physical server.
PaaS Platform-as-a-Service
This cloud service model is a managed hosting environment. The cloud provider manages the virtual machines and networking resources, and the cloud tenant deploys their applications into the managed hosting environment. For example, Azure App Services provides a managed hosting environment where developers can upload their web applications, without having to worry about the physical hardware and software requirements.
SaaS Software-as-a-Service
In this cloud service model, the cloud provider manages all aspects of the application environment, such as virtual machines, networking resources, data storage, and applications. The cloud tenant only needs to provide their data to the application managed by the cloud provider. For example, Microsoft Office 365 provides a fully working version of Microsoft Office that runs in the cloud. All you need to do is create your content, and Office 365 takes care of everything else.

Cloud Service Providers
Amazon – AWS
Microsoft – Azure
Google – GCP
Oracle – OCI
IBM
OceanDigital
Private Cloud:
VMWare -vSphere, vCenter, vCloud, vRealize..
Microsoft -Hyper-v, SCVMM, SCAC, SCDPM, SCSM
Citrix -XenServer, ..
OpenStack – Open Source Private cloud platfrom

SaaS – Salesforce, Microsoft 365, Dynamic 365, Google Docs,ServiceNow,..
PaaS – MS SQL Server, Oracle 12c,
IaaS – Compute – Azure VM,AWS EC2, ..
Storage – AWS S3, Azure BLOB, AWS EBS.,
Cloud Storages – OneDrive , Google Drive, iCloud..,

Domains:
Compute – Azure VM, AWS EC2, EBS, Auto-Scaling
Database – RDS -MySql, Oracle, MS Sql Server, MariaDB, Aurora,
NoSQL- DynamoDB, CosmosDB
Storage – S3, EBS, BLOB, Backup
Network -Route 53, VPC, CloudFront, Direct Connect
Message – SNS, SQS