Basically students can get a zero interest government loan (rises with inflation), and only need to pay it off once they make above a certain threshold ($51,957 according to the official website[1]). The payments are deducted as a percentage of your income, with the payments increasing with your wage.
This has a number of benefits:
1. Students whose degrees don't work out for them (i.e. can't find meaningful employment) aren't stuck with rising interest on their debts.
2. Allows poorer students to go to uni without parental support (I am currently a student and support myself entirely)
3. Reduces pressure on graduates to find a job just to pay off their debts. They can take their time to find a good job in their industry, rather than working lower-paying, unrelated work to pay off their loans.
My degree at UNSW in Australia will cost about $27k AUD (~$19k USD) and I'm unsure about the costs of others in my country. Under the HELP system, Australians are allowed a fair go at an education, and can take their future into their own hands (rather than relying on their parents).
[1] https://www.studyassist.gov.au/paying-back-your-loan/loan-re...