Which countries can obtain a visa on arrival in Australia?

Australia does not offer a traditional visa on arrival for most travelers; instead, visitors must apply for a visa online or in advance before arriving. However, certain passport holders from countries like Japan, Singapore, and South Korea can apply for an Electronic Travel Authority (ETA) or an eVisitor visa, which allows for easier entry. It's essential for travelers to check the specific visa requirements based on their nationality before planning their trip.