What type of Visa do you need?

Tourist Visa (ETA)
Valid for visits of up to 3 months within one year of the validity of the visa.
(Ideal if you're planning to visit relatives or travel as a tourist in Oz for up to three months)

Short Term Business Visa
Valid for ONE business visit of up to 3 months within one year the validity date of the visa.

Long Term Business Visa
Valid for the life of the passport. Multiple stays of three months on each visit.
(If you're planning to visit to Australia on business regularly, you should apply for this Visa)