Cloud computing is a model for enabling remote, on-demand access to a shared pool of configurable computing resources. It comprises three service models: SaaS, PaaS and IaaS. Editor’s note: On May 8, Fermilab Today ran “Fermilab explores SaaS,” a blog post that originally appeared on the website "SaaS in the Enterprise." Fermilab Today readers wrote to ask the meaning of the acronym SaaS. A Fermilab visiting graduate student explains: Software as a service (SaaS), platform as a service (PaaS) and…