Who needs an Australian tourist visa?
Citizenship: You are a citizen of a country that does not have a visa waiver agreement or Electronic Travel Authority (ETA) agreement with Australia. This applies to most countries, including India.
Length of Stay: You plan to visit Australia for longer than 3 months. If your stay is 3 months or less, you might be eligible for an ETA or eVisitor visa depending on your nationality (more on those below).
Activities: Your purpose of the visit is primarily for tourism or leisure. This includes sightseeing, visiting family or friends, and attending social events.