Former and returning resident (Subclass 155 and 157)

Resident return visa is for someone whose current permanent resident visa is expired or about to expire and they want to apply for extension of PR. Though you can continue to stay in Australia even if your visa has expired, you need to apply for a resident return visa if you like to travel outside Australia. In case you leave Australia, and your visa has expired, you can’t return until you have been granted a resident return visa. 

This visa is also used by previous permanent residents who have lived abroad for a longer period and now want to return to Australia, though there are certain eligibility criteria you need to meet to be able to grant this visa. 

Applicants must either meet residence requirements or show substantial ties to Australia to be able to get this visa.