What is tax free bond?

#1
Hi friends i have a query related to tax free bonds and how it is beneficial to us related to tax savings, pls share your thoughts.
 
#2
It's the first time I am hearing about that and it seems to me that such thing probably do not even exists anymore on so many levels I can't even describe here for so many levels. I do see it clear, we need to make it. I am waiting for your thoughts too.