The valuables that people leave are called the "collateral". The person can get their valuable item back from the pawnbroker if they pay back the money they were loaned and pay interest on the loan. Interest is like a fee for getting to use someone else's money for a set time period. If the person who has borrowed money from the pawnbroker does not repay the loan and interest within an agreed-upon time limit, the pawnbroker can sell the valuable item to another customer to get back the money they loaned.