Answer: Security Deposit
Step-by-step explanation:
A Security Deposit is an amount you pay when you first move into a house.
It is held in abeyance until you move out. In other words when you pay a Security Deposit, it doesn't become the Landlord's. It is still your money but it is held in trust. The purpose being that when you move out, any damages made to the house is fixed from the security deposit. If no damages need fixing then your entire security deposit is returned to you.
This fee is what Chad's landlord just explained to him.