When you jump on that plane for a trip of a life time, not only do you require a valid passport, but you also need to ensure you have the relevant visa.
The ETA visa is a modernised visa in an electronic format, so long gone are the days of labelling and stamping in your passport. This electronic visa means officials can access all the documentation required, simply by using your details on your valid passport.
Due to the sheer scale of Australia, many choose to spend some considerable time travelling and exploring. The ETA tourist visa allows multiple trips in one year, for a maximum of three months.
When in Australia on an ETA tourist visa you are not allowed to work. Applications for a tourist visa should be made before booking your flights.