The Subclass 601 Electronic Travel Authority (ETA) Visa
This visa lets you visit Australia for tourism or business purposes, as many times as you want for up to a year and stay for a maximum of three months on each visit.
To successfully apply for a subclass 601 ETA visa you must apply from outside Australia and have a passport from a specified country.
The Subclass 651 eVisitor Visa
The subclass 651 eVisitor Visa lets you visit Australia for tourism or business purposes for up to 3 months at a time within the 12 months period.
You must be outside of Australia to apply for the eVisitor visa and hold a passport from a specified country.
The Subclass 600 Visitor Visa
The subclass 600 Visitor visa lets you visit Australia for tourism or business purposes, for up to 3, 6 or 12 months.
This is the only Visitor visa that can be applied for inside Australia. It can also be applied for from outside Australia. If you are a passport holder of a specified country, you can apply for the visa online. Applicants from countries who are not approved for online applications must submit a paper application.