An ETA enables genuine short term tourist or business visitors to Australia of nominated nationalities to obtain authority to travel to Australia at the same time as they book their travel arrangements without the need to apply for a Visa. The ETA is issued electronically through computer links between DIAC and travel agents, airlines and specialist service providers around the world. The conditions are that you will not work in Australia and you will not stay in Australia for more than 3 months. A visitor ETA is valid for multiple travels to Australia for 12 months from the date of issue.