Identity document
Other forms of officially accepted identification include the driver's license and the birth certificate. However, these are accepted only in limited circumstances and cannot take the place of the ID Card in most cases. The ID Card is mandatory for dealing with government institutions, banks or currency exchange shops. A valid passport may also be accepted, but usually only for foreigners.
Australian Certificate of Identity
The Australian Certificate of Identity (COI) is a biometric travel document issued by the Department of Foreign Affairs and Trade to individuals who are not Australian citizens and are about to leave Australia or one of its territories.