What Does "sec 125 Health" Pre-tax Deduction on Your Paystub For?

I noticed this on my paystub and I don't know what it is for? It is excluded from federal taxes so I think it maybe related to my flexible healthcare spending account, but wasn't sure. Can someone confirm this is true and/or point me to a website that would tell me what this is?

Suggestion:

I don't understand it all, nor do I want to understand it, but here is a website that should help you understand it!
U.S. Department of Labor
Bureau of Labor Statistics

http://www.bls.gov/opub/cwc/cm20070321ar01p1.htm

Tagged as: SEC125 Pay Stub