Every person who is not an Australian citizen requires a visa to be in Australia.
There are over 150 different classes and sub-classes of visa, all for different purposes, ranging from short entry tourist visas to permanent residency visas, and everything in between.
If you are in Australia but do not hold a visa, you may be an “unlawful non-citizen” , and that can lead to serious consequences.
Find out more here – FAQS