This primer from Bond Economics is a very good and well worth a cross posting!
This primer answers the question “What is a government bond?” is in terms of defining what a bond does. The answer is that a government bond is an instrument that drains reserves from the banking system. This is not the standard way of looking at government bonds, but I believe it is the key ingredient explaining…..
http://www.bondeconomics.com/2013/10/what-is-government-bond.html