https://www.cloudwards.net/understanding-cloud-terminology-what-does-iaas-paas-and-saas-mean/

• IaaS, Infrastructure-as-a-Service
• PaaS, Platform-as-a-Service

Linux Server

Apache/nginx web server

MySQL database

WordPress

• SaaS, Software-as-a-Service
• UCaaS, Unified-Communications-as-a-Service
• GaaS, Gaming-as-a-Service

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more on SAAS in this IMS blog
https://blog.stcloudstate.edu/ims?s=saas

more on cloud computing in this IMS blog
https://blog.stcloudstate.edu/ims?s=cloud+computing