In a nutshell, a charge is the legal paperwork that we would recognise as a mortgage. In our case, we give our lender first right to our home if we can't pay. The charge provides an element of security to the lender so they have priority over other lenders which in turn means lower risk, therefore lower interest rate.
When it is "satisfied", the lender gives up the right, typically when we finally pay off our mortgage.
As far as I can tell, the charges recently satisfied were taken out from about 2007 - 2009, the latter when we were relegated, the security given to Barclays Bank.
Satisfying the charge may mean nothing, that it has been a historical oversight if NUFC has not had to borrow from Barclays in the interim.
It could mean that the club's banker is now officially Ashley's Piggy Bank.
It could mean that any bank borrowings are unsecured and subject to a higher rate of interest.
Alternatively, it could be a clearing of the decks ready for a takeover.
Let's hope it is the latter.