Australia Electronic Travel Authority (subclass 601)

The Electronic Travel Authority (subclass 601) is for holders of an ETA-eligible passport who want to visit Australia for tourism or as a business visitor. According to the Department of Home Affairs, with an ETA you can visit Australia as often as you wish within a 12-month period and stay up to three months on each visit. It is applied for online before you travel. Eligibility depends on the passport you hold, so check the official visa listing to confirm whether the ETA is open to you before you apply.