What's the difference between a Legislative Act and a Regulation?

An Act of Parliament is a law made by the Australian Parliament. In the Australian Parliament, a law is made after a bill – a proposed law – is passed in the same form by the Senate and House of Representatives and is given Royal Assent by the Governor-General. It is then called an Act of Parliament. 

Sometimes the Parliament gives the power to make decisions about the details of laws it makes to a minister or government department. This is called delegated law because the power has been delegated – given – to the minister or department. Regulations are a type of delegated law. Sometimes regulations are referred to as rules.

Delegated law allows the specific details of an existing law to be made or changed without having to be debated and passed by the Parliament. The Parliament usually keeps the right to overrule – disallow – delegated law if it does not agree with it. Standards and ordinances are other examples of delegated law.