Australia was first used as a penal colony by the British.
It depends upon the context. The first European use of Australia was as a penal colony and free settlement by the British.
However, apart from the indigenous aboriginal population, Australia was first used as gathering grounds for trepang, or sea-slugs, by the Macassan traders, because trepang was a prized delicacy in China.
Britain was the first to claim Australia, although the Dutch, Portuguese and French had explored parts of the continent's coast. Australia was first used as a penal colony for England's excess prisoners.
Lantana was first introduced in Australia in the 1840s. It was initially brought over to be used as an ornamental shrub or for hedges.
Petroleum was first found in Western Australia.
The first telephone in Australia was installed in Melbourne in 1879.
Australia's first residents were the Aboriginal and Torres Strait Islander people.