ELECTRONIC TRAVEL AUTHORITY THE ETA VISITOR
An ETA is equivalent to a visa, but there is no stamp or label in your passport and there is no need for you to visit an Australian diplomatic office to submit an application. Applications for ETAs can be submitted through travel agents or airlines.
If you are traveling for tourism or to visit friends or relatives, you should apply for the Visitor/Tourist ETA. It is valid for 12 months with stays of up to 3 months on each visit, and can be used for single or multiple entry travel. Employment is prohibited.