According to the Australian Visa Bureau, "the ETA replaces visa labels or stamps and removes the need for application forms. The Australian ETA is an electronically stored authorisation for travel to Australia, meaning you don't need paper documentation or a stamp in your passport."
This is confirmed by the Australian Electronic Travel Authority, "you will need to apply for either a visa or an ETA (Electronic Travel Authority). An ETA will let you spend up to three months in Australia."
Source(s):
http://www.eta.immi.gov.au/
http://www.visabureau.com/australia/tourist-visa.aspx

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