AUD/JPY is the exchange rate between the Australian dollar and the Japanese yen, showing how many yen one Australian dollar will buy. It is a cross pair, meaning it leaves the US dollar out entirely, and it is one of the market's most watched risk barometers. Liquidity is good for a cross, though spreads run a little wider than on the dollar majors.
The Australian dollar is the base currency and the yen the quote currency, so a quote of 99.00 means one Australian dollar buys 99.00 yen. A rising price means the Aussie is strengthening against the yen, a falling price the reverse. You trade AUD/JPY as a forex CFD, betting on the rate rather than holding the currencies: go long if you expect the Aussie to rise, short if you expect it to fall. Because the yen is the quote currency, a pip here is the second decimal place (0.01), and your profit or loss is the pips moved multiplied by your position size.
AUD/JPY is the classic expression of risk appetite in the currency market. The Australian dollar is a growth- and commodity-linked currency that rallies when investors feel bold, while the yen is a safe haven and a favourite funding currency for carry trades, so it strengthens when nerves take over. Add the gap between the Reserve Bank of Australia and the historically ultra-loose Bank of Japan, plus Chinese demand for Australian commodities, and the pair tends to climb in risk-on phases and tumble when markets turn defensive.
Say AUD/JPY is trading at 99.00 and you buy one standard lot (100,000 Australian dollars), expecting risk appetite to lift the Aussie. Each pip is worth 1,000 yen, so a 50-pip rise to 99.50 gives:
50 √ó 1,000 = 50,000 yen
A 50-pip fall to 98.50 would instead cost 50,000 yen. With the base currency not in US dollars, your margin at 30:1 is roughly 3% of the position's value, which magnifies both gain and loss.