Australian passport holders do not need a visa to enter Australia. New Zealand passport holders can travel to Australia without a visa and obtain a visa on arrival at the airport. More information is in Entry requirements for New Zealand Citizens.
All other passport holders need the right visa to come to Australia. You also need to get your visa before you travel to Australia. You might also need a visa to transition through Australia to another destination. Find the right visa There are different visas depending on your travel purpose and length of visit. Each visa has conditions about what you can do in Australia. Having a visa to enter Australia does not automatically mean you can work, study or undertake other activites. Make sure you apply for the visa that matches what you want to do in Australia, and that you are eligible to apply for that visa.
