A dependent visa in Australia allows close family members, like spouses, de facto partners, and dependent children, etc. to join a visa holder or sponsor already living in Australia. It is available under various visa subclasses, including student, skilled worker, and partner visas. These visas let dependents live, and often study or work, depending on their specific visa conditions. If you're in Canada and want to join a family member in Australia, you can apply online through ImmiAccount, the official platform for Australian visa applications.