Genetically modified (GM) foods are those which are derived from genetically modified organisms. These cannot be used unless thay have been approved. All of the GM foods approved in Australia to date are plants. The majority of these are used as animal feed.
The Office of the Gene Technology Regulator (OGTR) is the body responsible for the regulation and approval of GM foods in Australia.
Food Standards Austarlia new Zealand has recently reviewed and released a series of fact sheets about Genetica modification and GM foods.
The following link is to the main page on the Food Standards website about GM food; https://www.foodstandards.gov.au/consumer/gmfood/gmoverview/Pages/default.aspx