What is SaaS? And the difference to IaaS, PaaS?

I build SaaS for more than 3 years so I know a thing or two.

Difference between SaaS, IaaS and PaaS by Andriy Diduh SaaS Software Engineer
Difference between SaaS, IaaS and PaaS

Software as a Service — SaaS

Who uses SaaS?

Examples of SaaS?

Only eCommerce and SaaS?

Project Heroku, DigitalOCean,Azure,Render one-click deployment options by Andriy Diduh — SaaS Software Engineer
Project Heroku, DigitalOCean,Azure,Render one-click deployment options by Andriy Diduh — SaaS Software Engineer
One-click deployment options for Hasura

Software Engineer & SaaS Developer — https://andriydiduh.com