Australian dollar is popular currency. Australia actually is always looking step forward and probably will be one of the first countries in the world which will start virtual Australian currency.
At the moment Australian dollar has 5 denominations of banknotes $5, $10, $20, $50 and $100. From 2016 Australia started new polymer series banknotes. First tries are with $5 and $10 banknotes, but plan is to change all banknotes from paper to polymer.
If we talk about AUD trading, so it’s the fifth most tradable currency in the world.