The 457 Temporary visa allows you to enter Australia with the working permission for a period from day one to 4 years.
This visa allows overseas owners to sponsor themselves or sponsor the staff members to fulfil the business requirements or contract.
This visa allows your dependent to Australia with the permission of working & studying.
It will be a multiple entry visa.
This visa allows both the employee to work in Australia and also the business owner to set up branch office in Australia or have an contract with the Australia.