Great info, thanks. But then how all the rates are extremely similar all around the world like they agreed on it?

Thanks Robus. The last trade is the the exchange rate in the FX program, I get you. Then what about other trading programs? do they share the same record of that last trade? If yes, by whom it is managed? if no, then why all the exchange rates are fixed around the world? + before there was programs and IT for that matter, how had it been determined?

So the number in the currency pair market is offered by which one of these people? and how does he express it?

Thanks! a great answer, so I can gain -a relatively safe- fair amount of money by setting, waiting for a chance that it goes up and I earn few coins :)