https://azure.microsoft.com/en-us/overview/what-is-iaas/
PaaS - platform as a service
https://azure.microsoft.com/en-us/overview/what-is-paas/
SaaS stands for software as a service
https://azure.microsoft.com/en-us/overview/what-is-saas/
aPaaS allows for rapid application development and delivery. This form has high productivity and high control. The coding process for platforms as a service can slow down delivery, but aPaaS brings automation for the application lifecycle. aPaaS offers a faster way to build apps
iPaaS is a cloud-based integration solution, unlike SaaS which is hosted by a vendor on-premise. It iPaaS allows applications that reside on the cloud or on-premise to integrate and have data flow freely between them. It does not need any download, it is simply deployed. This is the most balanced offering because it can bring differently hosted software solutions or applications together.
Reference
Cloud Service Models (IaaS, SaaS, PaaS)https://www.cmswire.com/cms/information-management/cloud-service-models-iaas-saas-paas-how-microsoft-office-365-azure-fit-in-021672.phphttps://docs.microsoft.com/en-us/azure/azure-glossary-cloud-terminology
Cloud computing terms
https://azure.microsoft.com/en-us/overview/cloud-computing-dictionary/
Compare AWS and Azure
https://www.cloudyn.com/blog/azure-terminology-for-aws-speakers/
Windows Azure Platform Glossary for IT Pros
https://blogs.technet.microsoft.com/yungchou/2011/04/21/windows-azure-platform-glossary-for-it-pros/
https://ryvit.com/the-difference-between-ipaas-apaas-and-saas/
https://www.computenext.com/blog/when-to-use-saas-paas-and-iaas/
https://msdn.microsoft.com/en-us/magazine/ee309870.aspx
Azure Maintenance
Use TRIM with unmanaged standard diskshttps://docs.microsoft.com/en-us/azure/storage/storage-about-disks-and-vhds-windows