Suppose you borrow money to buy something, like a car. The person or business that loaned you the money is called the “lender” or the “creditor. “
When you borrow the money, you sign a contract promising to repay the loan. The contract will state the dollar amount of each payment each month, the date it is to be paid, and how many payments will be required. If you do not pay on the loan, the creditor can sue you for the money you owe.
Most lenders will take an extra step to protect their right to be paid. The creditor usually also requires you to sign a “security interest” giving them a lien on the property you buy with the loaned money. The property you buy with the loaned money (in this case, the car) is called the “collateral.”
The “security interest” is what gives the creditor the legal right to take the car if you don’t pay. The creditor usually does not have to go to court first. They just come and take the car, because that protects the creditor more than suing you.