To compare the value of HKD and the value of AUD the currency pair HKD/AUD is used and this means that we want to know how much of AUD we need to buy one HKD. That amount is currently in 0.19140.
HKD is the base or transaction currency and the AUD has the denomination of quote currency or counter currency.
The value of this currency pair has been changing in the last hours and the data it has left us has been a minimum price of 0.19080 and a maximum price of 0.19140 , this translates to a percentage of the 0.47000% by having a variation of 0.00090.