The sector has undergone substantial change in recent years, with a decline in participation, intervention by university administrations, and the end of compulsory membership arrangements.
Although names such as union, student association, representative council and guild are common, in practice they provide little insight into an organisation's role on campus.
Where campus unions are being replaced with university-owned corporate entities, non-traditional names such as UWS Connect and UniCentre are becoming common.
In the late 19th and early 20th century, at each University these organisations developed closer links with one another, and eventually transformed into unified student associations.
Bonded in labour to a government authority, these students could exert some level of pressure against their future "employer" by joining a union and protecting the rights of newer graduates with little real life experience and new to the workforce.
A new National Union of Students was established to replace AUS, this time with a structure designed to make it harder for constituent organisations to disaffiliate.
State and federal Liberal parties began to consider policies to stop student organisations from using funding from compulsory universal membership on left-wing political activities.
Campus unions have traditionally been responsible for the provision of commercial services, such as food and retail outlets, and activity programs, such as those associated with orientation week.