Free Float Tang?????

I've never heard of floating the rear tang on a Savage rifle,
I do know that there is usually a small gap at the rear when
using an after market stock.some say fill the gap,some say don't.
What exactly is FLOAT THE REAR TANG?
Advantage for doing so.

I seemed to have answered my own question,I Googled the net,
man there is a boat load of information on floating the tang.
Lean something new everyday.

If your used to Remmy's, the idea of floating a Savage tang is counter productive.