This visa is a permanent residence visa designed for applicants who are either married to or are in a de-facto relationship with an Australian citizen or permanent resident, or an eligible New Zealand citizen and who seek to live in Australia with their Australian partner. It is usually only for people who currently hold a temporary partner visa (Subclass 309)
With this visa, you can
In addition to what you can do on your subclass 820 visa, you can: live, work and study in Australia indefinitely, sponsor eligible family members to come to Australia, and apply for Australian citizenship if eligible.