If we were to rank the Cloud Computing acronyms (SaaS, PaaS, DaaS, and IaaS) in terms of people’s familiarity with them, Infrastructure-as-a-Service would probably come up dead last.

(If you’re confused already, skip to our 6-part series of Bytes on: “What is Cloud Computing?”)

What is SaaS?  Software as a Service is a form of computing where you rent software from a service provider, rather than purchasing it yourself.  Google Docs, QuickBooks, Salesforce and other CRM applications are all instances of SaaS.