Visitor ETA Visa
If you are travelling for tourism or to visit friends or relatives, and wish to stay for up to three months on each visit within a twelve month period, you should apply for the Visitor/Tourist ETA.
Short Validity Business ETA Visa
If you are travelling on business and intend just one visit to Australia, you may apply for the Short Validity Business ETA. It entitles the holder to one visit to be made within 12 months and permits a stay of 3 months from date of arrival.