Australia offers Visitor Visa under 3 categories: Subclass 601, 651, 600.
Under subclass 651 eVisitor Visa is issued to nationals of EU countries for the purpose of tourism or business
Subclass 601 is Electronic Travel Authority Visa for nationals of some non-european countries who wish to visit Australia for tourism or business purposes.
Subclass 600 is a Visitor Visa issued to those who doesn’t fall under the above two categories or to those who would like to extend the stay in Australia.
. Subclass 600 Visa has 4 different categories, which are Tourists, Business trip, Sponsored Family Trip and Approved Destination Status.
Application to this category of Visa is complicated in nature because of the documents required to establish the fact that the applicant has a genuine purpose of visit to Australia for a selected time period. In some cases some category of applicants may get denied a Visa under this subclass.
Visitors are not permitted work and depending on an applicants requirement 1-18 months of Visa can be issued. Those who are planning to visit Australia for medical purpose, Medical Treatment Visa under Subclass 602 is issued. Those who which a transit through the country, they may apply for a Visa under Subclass 771.
Since Visa under the above categories are complicated in nature and requires more document, one should consult immigration experts like Aspireglobal to get it done properly.