Please provide an answer of half of page using own words, based on Australian law

Benny now seeks your advice as he is very confused about his entitlements in his new job. The reason Benny is confused is because when he looks at his payslip, he notices some deductions being taken out under the heading of "Superannuation". He cannot uderstand what the amount is taken out for and wants this money back to spend on investing in shares.