The partner visas (subclasses 820 and 801) enable the partner or spouse of an Australian citizen, Australian permanent resident, or eligible New Zealand citizen to reside in Australia. The temporary Partner visa (subclass 820) is granted initially, allowing you to stay in Australia while the permanent Partner visa (subclass 801) is being processed.
The marriage must be valid under Australian law. This means you must have parental permission if you are 16 or 17 years of age. You must have been in a de facto relationship for at least 12 months.