The actress in the Progressive Insurance commercial is Stephanie Courtney. Her commercial name is Flo.
Other roles in which Stephanie Courtney has appeared:
"Mad Men" (Marge, a secretary)
"Blades of Glory" (reporter)
"The Brothers Solomon" (Sara)
"The Heartbreak Kid" (Gayla)
"For Your Consideration" (boom operator)
"Faking the Video" (Stephanie)
Progressive is an insurance company that provides Car Insurance. Their commercials feature a character named Flo who always greets the customers with "Welcome to Progressive" and explains how Progressive can be cheaper than other insurance companies because customers can customize their policies.