GBP/AUD is the exchange rate between the British pound and the Australian dollar, showing how many Australian dollars one pound will buy. It is a cross pair without a US dollar leg, pairing a major reserve currency with a commodity-linked one, and it has a reputation for being lively. Liquidity is fair, though the spread and daily range are wider than on the dollar majors.
The pound is the base currency and the Australian dollar the quote currency, so a quote of 1.9200 means one pound buys 1.9200 Australian dollars. When the price climbs the pound is beating the Aussie; when it drops the Aussie is ahead. You trade GBP/AUD as a forex CFD, taking a view on the rate rather than swapping cash: go long if you expect the pound to climb, short if you expect it to slide. Pips are read at the fourth decimal place, and your gain or loss comes to the pips moved times your position size.
GBP/AUD pits the Bank of England against the Reserve Bank of Australia, so divergence in their rate paths is the main engine. On top of that sits a risk-sentiment angle: the Australian dollar is a growth-sensitive currency that firms when markets are confident, while the pound trades more on UK growth, inflation and politics, so the cross can lurch on a single domestic headline from either side. Commodity prices feed the Aussie leg and can stretch the range further.
Say GBP/AUD is trading at 1.9200 and you buy one standard lot (100,000 pounds), expecting the pound to firm. Each pip is worth 10 Australian dollars, so a 50-pip rise to 1.9250 gives:
50 √ó 10 = 500 Australian dollars
A 50-pip fall to 1.9150 would instead cost 500 Australian dollars. With the pound rather than the US dollar as the base currency, your margin at 30:1 is about 3% of the position's value, which magnifies both gain and loss.