Super or Superannuation, is a compulsory government scheme to help you save for retirement. Your employer makes contributions and you can also contribute. This money is then invested on your behalf by your Super fund
Super is designed to be a tax effective way for you to save for your retirement, with contributions and investment earnings in your Super fund taxed at a lower rate. You can access the money in your Super fund when you reach your preservation age in line with the Superannuation Industry (Supervision) Regulations 1994, which is usually the age at which you retire from working
https://www.moneysmart.gov.au/superannuation-and-retirement/how-super-works/getting-your-super