What is Collateral?
If there is a main security for a debt, such as a house securing a mortgage, any extra security supplied is called collateral.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is Collateral?
### Input: 
### Response: If there is a main security for a debt, such as a house securing a mortgage, any extra security supplied is called collateral.