Eligible countries: US, UK, Canada, most EU, Japan, Korea, Malaysia, Singapore, NZ, and others (full list on Australian immigration site).
Requirements:
Documents: Passport, bio-page copy, digital photo, citizenship proof, income proof, travel dates.
Process: Apply online (usually 24-hour decision). Print approved ETA; carry when traveling. Allows up to 90 days for tourism/business. Must depart before expiry.
Tips: Apply early; ensure accuracy; pay fee; monitor email.