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Currency bill tracking is the process of tracking the movements of banknotes, similar to how ornithologists track migrations of birds by ringing them. It is usually facilitated by any one of a number of websites set up for the purpose, which can track currency among the users of that website. A user may register a bill by entering its serial number, and if someone else has already registered the bill, then the "route" of the bill can be displayed.
Some bill tracking sites encourage marking a bill before spending it, whereas others do not. This usually depends on the laws of the country issuing the currency.
The most popular currencies for currency tracking are the euro, the United States dollar (USD), and the Canadian dollar (CAD).